Club of Mozambique explains how the assassination getaway failed and thus disclosed identities of the death squad:

This was no ordinary murder: Matavel, a leading figure in election observation, was shot dead in broad daylight, as he was leaving an observation training session in the southern city of Xai-Xai. But the assassins became involved in a traffic accident in which two of them died, two were arrested, and a fifth is on the run. On Tuesday the General Command of the Mozambican police announced that four of the assassins were members of the police force. For the first time the existence of a death squad, operating inside the police, was proved.