QUETTA, Pakistan -- A suicide bomber in Pakistan killed at least 70 people and wounded more than a hundred on Monday in an attack on mourners gathered at a hospital in Quetta, according to officials in the southwestern province of Baluchistan.
The bomber struck as a crowd of mostly lawyers and journalists crammed into the emergency department to accompany the body of a prominent lawyer who had been shot and killed in the city earlier in the day, Faridullah, a reporter who was among the wounded, told Reuters.
Abdul Rehman Miankhel, a senior official at the government-run Civil Hospital, where the explosion occurred, told reporters that at least 70 people had been killed, with more than 112 wounded, as the casualty toll spiked from initial estimates.
"There are many wounded, so the death toll could rise," said Rehmat Saleh Baloch, the provincial health minister.
Jamaat-ur-Ahrar, a faction of the Islamist militant Pakistani Taliban group, claimed responsibility for the attack in an email.
It was not immediately clear if the group had carried out the bombing, as it is believed to have claimed responsibility for attacks in the past that it was not involved in.
"The Tehreek-e-Taliban Pakistan Jamaat-ur-Ahrar takes responsibility for this attack, and pledges to continue carrying out such attacks," said spokesman Ehsanullah Ehsan in the statement.
Only last week, Jamaat was added to the United States' list of global terrorists, triggering sanctions.
Television footage showed scenes of chaos at the hospital in Quetta, with panicked people fleeing through debris as smoke filled the hospital corridors.
Bodies lay strewn across a hospital courtyard shortly after the blast and pools of blood collected as emergency rescuers rushed to identify survivors.
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The motive behind the attack was unclear, but several lawyers have been targeted during a recent spate of killings in Quetta, the provincial capital of Baluchistan which has a history of militant and separatist violence.
The latest victim, Bilal Anwar Kasi, was shot and killed while on his way to the city's main court complex, senior police official Nadeem Shah told Reuters. He was the president of Baluchistan Bar Association.
The subsequent suicide attack appeared to target his mourners, Anwar ul Haq Kakar, a spokesman for the Baluchistan government, said.
"It seems it was a pre-planned attack," he said.
Ali Zafar, president of the Supreme Court Bar Association of Pakistan, told reporters in the eastern city of Lahore:
"We (lawyers) have been targeted because we always raise our voice for people's rights and for democracy...Lawyers will not just protest this attack but also prepare a long-term plan of action."
Police cordoned off the hospital following the blast, with Prime Minister Nawaz Sharif and Army Chief General Raheel Sharif paying visits to the wounded on Monday evening.
In January, a suicide bomber killed 15 people outside a polio eradication centre in an attack claimed by both the Pakistani Taliban and Jundullah, another Islamist militant group that has pledged allegiance to Islamic State in the Middle East.
Monday's attack was the worst in Pakistan since an Easter Day bombing ripped through a Lahore park, killing at least 72 people. Jamaat-ur-Ahrar also claimed responsibility for that atrocity.
Quetta has long been regarded as a base for the Afghan Taliban, whose leadership has regularly held meetings there in the past.
In May, Afghan Taliban leader Mullah Akhtar Mansour was killed by a U.S. drone strike while traveling to Quetta from the Pakistan-Iran border.