The Ugandan vanguard of an African peacekeeping force intended to help Somalia's interim government tighten its tenuous grip on the anarchic nation flew into the country Thursday, witnesses said.

Underlining the formidable task awaiting the African Union (AU) mission, gunmen shot dead three people at the house of the director of Mogadishu's port, the latest in a wave of guerrilla-style attacks in the coastal capital.

A cargo plane dropped off 35 uniformed Ugandan officers early in the morning at the government stronghold of Baidoa, customs officer Ali Mohamed Adan said. Police officer Isak Hassan Warsame also said he saw the Ugandan officers land.

But Ugandan army Captain Paddy Ankunda, a spokesman for the AU mission, denied any military personnel had left yet. "There are no troops in Somalia," he said in Uganda.

Baidoa is the south-central trading town the government used as a temporary base before ousting militant Islamists from Mogadishu in a December offensive backed by Ethiopia's military.

The town is expected to be a key rear staging area for the proposed 8,000-strong AU force, designed to replace Ethiopian troops who helped President Abdullahi Yusuf's government defeat the Islamists in less than two weeks.

The Ugandan peacekeepers are due to patrol Mogadishu, one of the world's most dangerous and gun-infested cities.

Uganda has kept the exact troop deployment date secret, aware that insurgents who blast away almost daily at joint government-Ethiopian forces in Mogadishu have threatened to attack any peacekeepers or government allies.

(China Daily via agencies March 2, 2007)