Afghan officials say a suicide bomber struck outside a Shiite mosque in Kabul, killing at least six persons and wounding 10 others, the local TOLO news agency said.

Interior Ministry spokesman Najib Danish said casualties were expected to rise after Thursday’s attack. Health ministry spokesman Wahid Majroo said one body was received at a local hospital, along with five wounded people.

Among those killed was prominent Kabul businessman Ramazan Husainzada. According to local media reports, he was badly wounded in the attack and died in hospital from his injuries.

The Taliban denied involvement in the attack, saying the group "never targets mosque". The rival Islamic State militant group was yet to issue a statement.

Muslims are observing the holy month of Ramzan, during which the faithful fast from sunrise to sunset. Mosques are typically crowded in the evening hours during the holy month.