Lahore, Pakistan – As funerals were held on Saturday for more than 30 people killed in a suicide bombing at a mosque in Islamabad, analysts warned the attack could be part of a broader attempt to inflame sectarian tensions in the country.A suicide bomber struck the Khadija Tul Kubra Mosque, a Shia place of worship, in the Tarlai Kalan area of southeastern Islamabad during Friday prayers.Recommended Stories list of 4 itemsend of listIn a statement, the Islamabad administration said 169 people were transferred to hospitals after rescue teams reached the site.Hours later, a splinter faction of the ISIL (ISIS) group in Pakistan claimed responsibility on its Telegram channel, releasing an image it said showed the attacker holding a gun, his face covered and eyes blurred.Pakistan’s Defence Minister Khawaja Asif said mosque security guards tried to intercept the suspect, who opened fire before detonating explosives among worshippers. He alleged the attacker had been travelling to and from Afghanistan.Security officials on Saturday told Al Jazeera that several key arrests had been made, including close family members of the suicide bomber in Peshawar and Karachi. They did not clarify whether there was evidence of their involvement in the plot.Capital under fire?Islamabad had seen a relative lull in violence in past years, but things have changed in recent months. The bombing marked the second major attack in the federal capital since a suicide blast targeted a district court in November last year.Abdul Sayed, a Sweden-based analyst on conflict in Afghanistan and Pakistan, said ISIL’s Pakistan branch, referred to as ISPP, claimed responsibility fo …