NEW DELHI: The Islamic State has claimed responsibility for the Kabul gurdwara attack on Wednesday but people familiar with the Afghanistan-Pakistan region do not rule out the hand of ISI-backed Teherik-e-Taliban Pakistan (TTP) or Pakistan which may be aiming to consolidate its position following the US-Taliban deal.SITE Intelligence Group, which monitors activities by alleged terrorist groups, said the Islamic State has claimed responsibility for the attack which killed 25 people.Sources said as the Taliban consolidates its position, TTP will be aggressive in Afghanistan with alleged support from the Pakistan’s intelligence agency ISI. Many of TTP's leaders are veterans who have fought in Afghanistan and have supported the fight against the NATO-led International Security Assistance Force by providing soldiers, training and logistics. According to Narinder Singh Khalsa, a member of parliament representing the country’s Sikh minority, three suicide bombers entered the gurdwara’s dharamshala, the sanctuary area within the complex, and began shooting at worshippers.India condemned the attack, calling it “cowardly”. “We convey our sincerest condolences to the immediate family members of the deceased and wish speedy recovery to the injured. India stands ready to extend all possible assistance to the affected families of the Hindu and Sikh communities of Afghanistan,” the external affairs ministry said in a statement.Earlier this month, an affiliate of the IS attacked a gathering of minority Shia Muslims in Kabul, killing 32 people.