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Photo taken on Aug. 5, 2019 shows the site of a bomb explosion in Herat province, Afghanistan. At least four civilians were killed and 30 others wounded in a motorcycle bomb explosion in Afghanistan's western Herat province on Monday, the provincial public health director said. (Photo by Elyas/Xinhua)

HERAT, Afghanistan, Aug. 5 (Xinhua) -- At least four civilians were killed and 30 others wounded in a motorcycle bomb explosion in Afghanistan’s western Herat province on Monday, the provincial public health director said.

“Four killed and 30 wounded were admitted into Herat Regional Hospital following Monday evening's explosion in Police District 12 of provincial capital Herat city,” Abdul Hakim Tamana told reporters at the government hospital.

The number of the casualties was likely to rise, the official added.

The explosion occurred after an Improvised Explosive Device attached onto a motorcycle parked at the side of a road in Hajji Abbass neighborhood was detonated, provincial police officer Farzad Frotan told Xinhua.

Frotan added that the attack took place roughly at 7:00 p.m. local time when people were preparing for evening prayers.

No group has claimed responsibility so far.

Over the past months, Afghanistan has witnessed waves of terror attacks by the Taliban and Islamic State (IS).

On Sunday, a bicycle bombing struck a bus carrying journalists of a local TV channel in Kabul, killing two people and injuring four others.