A suicide attacker blew himself up near a crowd of police and protesters in Kabul on Thursday, killing at least 11 people and wounding 25 others, officials said, in the latest deadly violence to bring carnage to the Afghan capital.

“A suicide attacker has detonated himself... close to the policemen who were trying to provide security for an ongoing protest,” deputy interior ministry spokesman Nasrat Rahimi told AFP.

Wahid Majroh, a health ministry spokesman, told AFP that 11 bodies had been taken to hospitals around the city along with 25 others wounded. Majroh added that the toll could rise.

A security source who spoke to AFP on the condition of anonymity said 20 people had been killed and 20 wounded in the attack, but that higher toll could not be immediately confirmed.

There was no immediate claim of responsibility for the attack which happened during a protest following the death of a shopkeeper during a police operation targeting alcohol and bootleggers, an unnamed official said.

The deadly assault comes a week after more than 40 people were killed and dozens more wounded in a suicide blast claimed by the militant Islamic State (IS) group that targeted Shias in Kabul.

The capital has become one of the deadliest places in war-torn Afghanistan for civilians in recent months, as the Taliban step up their attacks and the IS seeks to expand its presence in the country.

Last week's assault came days after a suicide bomber killed six civilians in a Christmas Day attack near an Afghan intelligence agency compound in the city, which was also claimed by the IS.

On December 18 militants from the group stormed an intelligence training compound in Kabul, triggering an intense gunfight with police, two of whom were wounded.

Security in Kabul has been ramped up since May 31 when a massive truck bomb ripped through the diplomatic quarter, killing some 150 people and wounding around 400 others — mostly civilians. No group has yet claimed that attack.

Despite the increased security measures militants continue to carry out attacks.