Police arrested seven men Thursday in last week's attack on a house full of mourners that killed 12 people and injured 17 in a strife-torn black township.

A number of men burst into a house full of people attending a funeral vigil March 27, firing wildly at the occupants.Survivors said the attackers spoke Zulu and police described the pre-dawn attack in Johannesburg's northern Alexandra township as part of South Africa's black factional violence.