(Image source from: Afghanistan suicide bomb in Jalalabad leaves many dead})

Kabul, Afghanistan (CNN)A suicide bomber on a motorbike blew himself up in front of the Kabul Bank in Jalalabad, Afghanistan, early Saturday, a local government spokesman said.

Terror group ISIS claimed responsibility for the attack. The explosion killed at least 33 people and wounded more than 100 others, said public health spokesman Najibullah Kamawal.

The claim looks to be the first in Afghanistan by ISIS, CNN's Nick Paton Walsh said. More specifically, it was made by an offshoot called ISIS Wilayat Khorasan.

In a statement, the group said that the bomber was named Abu Mohammad and that he belonged to their ranks. He was targeting government workers who may be 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 could be expected to be crowded.

Taliban spokesman Zabiullah Mujahid distanced his group from attack in a text message to media. "The explosion in Jalalabad doesn'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.

- Manohar. M