Islamabad, Pakistan (CNN)A bomb attack has left at least 27 people dead and up to 30 injured as Pakistanis vote amid heavy security in fiercely contested general elections.

The explosion took place on the outskirts of Quetta, Balochistan province’s capital. The cause of the blast was unknown, said the city’s superintendent of police Quetta, Naseeb Ullah.ISIS claimed responsibility for the attack. CNN cannot independently verify this assertion. In Khyber Pakhtunkhwa, one person was killed and three injured in a skirmish outside a polling station between supporters of Imran Khan’s Pakistan Tehreek-e-Insaf (PTI) and the province’s Awami National Party.Khan condemned the Quetta blast, saying in a tweet he was “saddened by the loss of innocent lives,” adding that “enemies of (Pakistan are) seeking to disrupt our democratic process … Pakistanis must defeat the terrorists’ design by coming out in strength to cast their vote.” A damaged police vehicle is seen after an apparent militant attack in Balochistan, Pakistan.A damaged police vehicle is seen after an apparent militant attack in Balochistan, Pakistan.A damaged police vehicle is seen after an apparent militant attack in Balochistan, Pakistan.Read MoreThe election has pitted cricket star Khan’s party in a tightly fought race against that of jailed former premier Nawaz Sharif. Shahbaz Sharif, who replaced his brother as their party’s candidate, said in tweet: “Heart broken to learn of martyrdom of innocent people including police officials … My profound condolences to the bereaved families.” A huge security operation was launched after several attacks in the lead up to the election. On July 16, 150 people were killed by a suicide bombing in Balochistan that targeted a political candidate and led to suggestions the vote could be delayed in order to get the situation under control.Police and military personnel were out in force at polling stations across the country, with security officials flying surveillance drones in the troubled northwest city of Peshawar. Long lines of voters queued in the major cities of Karachi, Quetta and Peshawar. Army officials said more than 370,000 troops had been deployed to ensure a “fair and free” election, with police estimating the total security force at 800,000 personnel. ‘Air of fear’ as votes castSpeaking to CNN in Peshawar, 36-year-old Sumera Khanum said Wednesday’s election was only the third time in her life she’d cast her vote. “There’s an air of fear but we have to come out and vote,” she said. “Women should come out along with men in large numbers to vote.”University graduate Amina Shams, 26, who was voting for the first time, said “we want to bring change for the youth.” But she added there was a “feeling of fear in Peshawar … when I left the house this morning I was scared.”Key timings8am local (11pm ET Tue): Polls opened6pm (9am ET): Polls close (could be extended to 7pm/10am if large turnout or delays in voting) 8-9pm (11am – 12pm ET): Election Commission of Pakistan to begin announcing regional results 11pm onwards (2pm ET): General results should start coming into shape, candidates may begin conceding or declaring victory Security concernsNewspaper headlines Wednesday were dominated by the pivotal election, with one describing it as on a “knife-edge.” Many also noted the heavy security presence as voters went to the polls. Nearly 106 million people are registered to vote for members of the lower house of parliament and four provincial assemblies.This week’s election is only the second time in Pakistan’s 71-year history that the country has seen a democratic transition of power. The run-up to the vote has been dogged by increasing tensions over allegations that the country’s powerful military has secretly backed Khan, a massive crackdown on the media and the electoral participation of militant groups.The Human Rights Commission of Pakistan (HRCP) has expressed “serious reservations about the extraordinary powers accorded to security forces” and called the election “the dirtiest” in the country’s history.The military has ruled Pakistan directly or indirectly for most of its history and retains tight control over defense and foreign policy, as well as its own business empire.Khan has repeatedly denied claims he is supported by the military, and condemned the harassment of election candidates.The former Pakistan cricket captain said he had voted, telling reporters: “I am a sportsman, I’m not going to declare victory until the last bowl has been bowled.” Pakistan election: Who is likely to be the country’s next leader?Tight raceWith Sharif’s incumbent Pakistan Muslim League-Nawaz (PML-N) still on the back foot after his imprisonment, the election represents a real chance for Khan’s center-right PTI to break into the two-party system which has traditionally dominated national politics. The final result may go down to the wire, however, leaving candidates in coalition negotiations with the once dominant Pakistan People’s Party (PPP), led by the 29-year-old Bilawal Bhutto Zardari, son of former President Asif Ali Zardari and Prime Minister Benazir Bhutto. Pakistan has a wide array of smaller parties that could assume a new level of importance if Khan or another candidate needs to rely on them to form a coalition government. In among these fringe groups are some far-right Islamist parties, including some known to be sympathetic to militant groups. “It’s been quite some time since Pakistan’s political environment has been this fraught and polarized, so I imagine that any coalition will be fractious and divided,” said Michael Kugelman, a South Asia expert at the US-based Wilson Center. Khan has built on his sporting celebrity and the PTI’s success as a regional party to emerge as a change candidate, attracting religious conservatives and drilling down on Pakistan’s endemic corruption — a task made easier by Sharif’s conviction. Some analysts, however, say that he lacks the national-level political experience to enact any meaningful reform, and will be hampered by less than loyal allies in his party and the influence of the military. As polling began Wednesday, Khan’s supporters remained optimistic that if elected his slogan of building a “New Pakistan” would bear fruit. “I have just voted for PTI,” said Amna Gardar in Lahore, the capital of Punjab province. “If you want to be part of that change please come out, please vote.”All eyes will be on whether Shahbaz Sharif can maintain the PML-N’s grip on its stronghold in Punjab, Pakistan’s most populous and richest province. It will be exceedingly difficult for Khan to take power without winning Punjab. Analysts were divided over whether Sharif’s jailing would generate a sympathy vote.

Just cast my vote. High time that all of you came out to vote for Pakistan's progress and prosperity. May this election be a source of peace and stability for the nation!

— Shehbaz Sharif (@CMShehbaz) July 25, 2018 As early voters streamed to polling stations, Shahbaz tweeted that he had cast vote, urging his fellow countrymen to participate in the election.”High time that all of you came out to vote for Pakistan’s progress and prosperity,” he said. “May this election be a source of peace and stability for the nation!”In Balochistan, voters braved the polls despite the recent attacks. “I am voting Pakistan Peoples Party”, said Syed Izatullah, a young voter standing outside a polling station in Quetta, adding that Bilawal Bhutto could pull Pakistan out of its troubles.”My vote is for Muttahida Majlas e Amal (a religious alliance)”, said black-bearded Habibullah Khan.Whoever forms the next government of Pakistan, an Islamic republic of 207 million people, will have to deal with a massive debt crisis. The nuclear-armed state also faces uncertainty over its relationships with the US, which has cut military aid due to Islamabad’s alleged support for the Taliban in neighboring Afghanistan, and China, which has financed multi-billion-dollar infrastructure projects in the South Asian country.

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