Pakistan held funerals on Monday for victims of a suicide bombing that targeted a rally of a pro-Taliban cleric the previous day as the death toll climbed to at least 45 and the government vowed to hunt down those behind the attack. No one immediately claimed responsibility for Sunday's bombing, which also wounded 200 people. Police said their initial investigation suggested the Isis group's regional affiliate could be behind the attack. The victims were all from the Jamiat Ulema Islam party, led by cleric and politician Fazlur Rehman. He didn’t attend the rally, held under a large tent close to a market in Bajur, a district in the Khyber Pakhtunkhwa province that borders Afghanistan. The Isis regional affiliate – known as the Islamic State in Khorasan Province – is based in neighbouring Afghanistan's Nangarhar province and is a rival of the Afghan Taliban.…