Government officials in Somalia's capital say a landmine blast has killed at least two civilians.

The mine exploded Thursday in southern Mogadishu as a government convoy drove past.

The city has been relatively quiet since the interim government declared victory over Islamist insurgents in late April. But earlier this week Monday, at least four police officers were wounded when their vehicle exploded in Mogadishu.

Elsewhere in Somalia, an international aid organization said two of its workers have been kidnapped in a semi-autonomous province.

A spokeswoman for the group CARE said the workers, one Kenyan and one British, have been missing since Wednesday in the northeastern region of Puntland. She said the organization is working with authorities and local elders to resolve the situation.

Also Thursday, a maritime official in neighboring Kenya, Andrew Mwangura of Kenya's Seafarer's Assistance Program, said hijackers are holding a vessel at the Somali port of Hobyo, north of Mogadishu.

He said gunmen seized the cargo ship on May 3 as it sailed from the United Arab Emirates.

Some information for this report provided by AP, AFP and Reuters.