KABUL — A suicide bomber struck Monday near an office of the Afghan intelligence service in Kabul, killing at least six people, including a woman in a passing vehicle, officials said.

The Islamic State claimed responsibility for the attack.

Interior Ministry spokesman Najib Danish said another three people were wounded in the bombing, adding that the exact target was unclear.

‘‘The bomber was on foot and detonated his suicide vest on the main road,’’ he said. Health Ministry spokesman ­Ismail Kawasi confirmed the death toll.

The bombing occurred a week after militants stormed a training center of the agency in Kabul.

Both the Taliban and the local Islamic State affiliate have carried out several attacks in the capital, mainly targeting security forces. ISIS has been ratcheting up attacks on government buildings and, most recently, Shi’ite mosques in Kabul, exacting a heavy civilian toll.

Separately in southern Helmand province, six Afghan border police officers were killed when their military vehicle hit a roadside bomb, said Omar Zwak, spokesman for the provincial governor.

Six other police officers were wounded in the attack, which took place in Marjah district late Sunday afternoon.

Qari Yusouf Ahmadi, a Taliban spokesman, claimed responsibility for the attack in Helmand.

The Taliban, who have a strong and growing presence in Helmand, launch near-daily attacks across the country.

ASSOCIATED PRESS