Kabul, April 22 (NNN-KUNA) At least four Afghan civilians were killed in a suicide attack and a bomb blast in Afghanistan's southeastern city of Khost early on Sunday.

In the first incident, a bomb exploded at a shop in a busy market in centre of Khost city killing one shopkeeper and injuring seven more.

Residents said the bomb went off while the shopkeeper was opening his shop in the morning.

Hospital sources confirmed the killing of one civilian and injury of seven more in the explosion, that destroyed the mobile-phone shop in the market.

Separately, a suicide attack in the same city killed three civilians and injured four policemen hours after the first explosion.

A security official, requesting anonymity, told KUNA the bomber was wearing military fatigues and was riding a motorcycle. He said all the dead were shopkeepers, running their businesses in front of the military hospital in the city.

One four policemen injured, who were rushed to the hospital for treatment, said the officer. In yet another incident, the Afghan and coalition forces detained three suspected militants from a compound in the same province.

A press release issued from the US' Bagram military base on Sunday said "credible information led the combined force to the compound where inhabitants are linked to the Haqqani network and connected to extremist groups and activities in the Khost area."

One suspect was armed and was subdued by combined forces without incident, said the release.