Kabul , Afghanistan ( CNN ) A suicide bomber on a motorbike blew himself up in front of the Kabul Bank in Jalalabad early Saturday , a local government spokesman said . The ISIS terrorist group claimed responsibility for the attack . The explosion killed at least 33 people and injured more than 100 others , public health spokesman Najibullah Kamawal said . The claim appears to be the first in Afghanistan by ISIS , CNN 's Nick Paton Walsh said . It was made by an offshoot called ISIS Wilayat Khorasan . In a statement , the group said the bomber was named Abu Mohammad and he belonged to their ranks . He was targeting government workers collecting their pay at the bank , the terrorists said . He detonated his charge at the peak of rush hour on the first day of the week , when the bank would be expected to be crowded . Taliban spokesman Zabiullah Mujahid , in a text message to journalists , distanced his group from the attack . `` The explosion in Jalalabad does n't have anything to do with us and we condemn it , '' he said . ISIS refers to Afghanistan and Pakistan as the province of `` Khorasan . '' In March , CNN reported on ISIS recruiting in Afghanistan . The United Nations condemned the violence . `` The continuing use of suicide attacks in densely populated areas , that are certain to kill and maim large numbers of Afghan civilians , may amount to a war crime , '' said Nicholas Haysom , head of the United Nations Assistance Mission in Afghanistan . The United Nations said that in the first three months of the year 655 people were killed and 1,155 were wounded in suicide attacks throughout the country . Fears about ISIS involvement in the region have been growing this year . In February , Mullah Abdul Rauf , a former Taliban commander who had become a recruiter for ISIS in Afghanistan , was killed in a drone strike , according to officials who spoke to CNN . And later that same week , Gen. John Campbell , the top U.S. and NATO commander in Afghanistan , told the Senate Armed Services Committee that he was concerned about the growth of ISIS in the area . `` You do have some of the Taliban breaking off and claiming allegiance toward ISIS , '' Campbell said , attributing the phenomenon partly to a feeling of disenfranchisement on the parts of some Taliban members -- who , he said , may use ISIS tactics to gain media attention . CNN 's Brian Walker , Ben Brumfield and Don Melvin contributed to this report .
U.N. says suicide attacks on mass groups of civilians may be labeled as war crimes . ISIS condemns the attack , which Taliban took credit for . The bomber targeted government workers picking up their pay , Taliban said in a statement .