Police in Burundi have raided the home of an opposition party leader who accused the government of attacking the homes of five opposition politicians.

Witnesses say Pancrace Cimpaye was not home Wednesday when police arrived at the politician's Bujumbura residence with an arrest warrant.

Cimpaye has accused the government of being behind Sunday's grenade attacks on the homes of five political opponents critical of President Pierre Nkurunziza.

The politicians were among more than 65 members of parliament who sent a letter the the president, urging him to open a dialogue with opposition parties and form a national government.

The government has denied any link to the grenade attacks, which police say they are investigating.

Burundi has been struggling to emerge from a 12-year civil war. About 300,000 people were killed in the conflict.

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