Police in the Nigerian city of Lagos have launched a house to house search for the members of the militant Yoruba group, the Odua People's Congress or OPC, who allegedly abducted and killed a senior police officer at the weekend.

The police are also arresting everyone suspected of belonging to the group.

Police say they have uncovered a large cache of weapons and police uniforms in the suburb Bariga where the killing took place and arrested five people in connection with it.

Meanwhile, two other ethnic Yoruba organisations have moved to distance themselves from the OPC; one in the northern city of Kaduna urged the president to use all powers to curb it.

From the newsroom of the BBC World Service