Two Afghan police officers and a civilian were killed after a remote-controlled bicycle bomb detonated in a central part of Kandahar city Tuesday.
Witnesses said the bomb, planted on the bicycle, went off as a police pickup truck was driving by around 1:30 p.m. local time. The Taliban claimed responsibility for the attack.
The attack came on the day Kandahar's governor, Tooryalai Wesa, cut a ribbon at a ceremony marking the beginning of voter registration for Afghanistan's upcoming election.
There has been heightened concern about Taliban attacks while voter registration was open.
The presidential election is scheduled for September, while the parliamentary vote will take place the following year.
About 2,500 Canadian troops are stationed in Afghanistan, mostly in Kandahar province, as part of a NATO-led international mission in the war-torn country.