Three explosions apparently caused by rockets rattled the main coalition airbase that is home to Canadian troops in Kandahar early Friday.

No one appeared to have been injured in the attack, which took place about 3 a.m local time, a military spokesman said.

In the second nighttime attack on the base this week, warning sirens sounded, sending soldiers from the multinational force into emergency bunkers.

There was a similar attack Tuesday morning, when rockets were fired at a section of the base near the main runway. No one was hurt as two 107-millimetre rockets exploded inside the fenced compound and a third hit a minefield outside the wire.

The camp is home to most of Canada's 2,200 soldiers in Afghanistan.

The Friday morning assault came a day after a suicide car bomber blew himself up near a Canadian military convoy in Kandahar, wounding a Canadian soldier and six Afghan civilians, including a boy who later died.

On Wednesday, Pte. Robert Costall, a Canadian soldier, was killed when Taliban insurgents attacked a coalition outpost in a remote area outside Kandahar.