At least 30 people have been killed in a bomb explosion which targeted a Shia mosque in the Afghan capital, Kabul.

The bomb attack ocured in the Imam Zaman Mosque in the western district of Dasht-e-Barchi on Friday night as worshippers had gathered for prayers.

At least 45 people were also injured in the attack, an official at the Interior Ministry said.

According to a senior security official, the exact number of casualties was still unknown.

No group has yet claimed responsibility for the attack, while both ISIS and Taliban terrorist groups has targeted Shia mosques in Afghanistan in the past.

The same mosque was targeted by an explosion followed by gunfire in August.

There has been concerns in recent years over the alarming spreading of Shia killings in the war-torn country.

Last month, a bomb attack targeted another Shia mosque in Kabul, killing at least six people. The attack, which was claimed by ISIS, came just ahead of Ashura mourning ceremony.

Also in August, at least 40 Shia Muslims were killed in the Afghan capital when ISIS terrorists attacked a mosque packed with worshippers.

Afghanistan’s government has come under criticism over failure to take proper actions to protect its Shia Muslim population against terror attacks.