Alleged mastermind among four arrested after Pakistan mosque blast
Four people have been arrested on suspicion of facilitating a suicide bombing that killed more than 30 people on Friday, Pakistan's interior minister has said.
The Islamic State group has claimed responsibility for the bombing that targeted Friday prayers at the Shia mosque in the Tarlai area, when it was packed with worshippers.
More than 160 people were injured in the blast, which was the deadliest in the capital for more than a decade.
Huge crowds were seen in the city on Saturday, as thousands of mourners gathered for the funerals of the bombing's 32 victims.
Funeral prayers took place amid tightened security, with soldiers standing guard and police checkpoints set up in key areas.
Ashiq Hussain, who lost his 21-year-old nephew Mujtaba Ali in the attack, told the Reuters news agency his family was "broken".
Condemning the attack on Friday, Pakistan's Prime Minister Shehbaz Sharif expressed "deep grief". The country's President, Asif Ali Zardari, said "targeting innocent civilians is a crime against humanity".
Eyewitnesses and survivors of the blast have told the BBC how the attack unfolded, with one saying he "lost his senses" in the moments after the explosion and another saying he saw bodies "lying everywhere".
By Faig Mahmudov
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