A roadside bomb explosion injured four Canadian soldiers, one seriously, early Saturday morning in Afghanistan.

The blast, which occurred at 12:30 a.m. local time, struck a supply convoy travelling from the international base at Kandahar Air Field to Canadian forward operating bases in Kandahar province.

Two wounded soldiers and an Afghan interpreter were evacuated by helicopter to the hospital in Kandahar after first being taken to the forward operating base at Ma'sum Ghar -- seven kilometres away from the attack site.

Two other injured Canadian soldiers were treated at Ma'sum Ghar and released.

Military officials have confirmed that none of the injuries are life-threatening.

Taliban insurgents are increasingly using improvised explosive devices, or IEDs, as their weapon of choice.

A conservative estimate is that at least one vehicle a week is hit by a roadside bomb, reports The Canadian Press. More often, the IEDs are detected and defused by Canadian troops.

Thirty-eight of the 70 Canadian soldiers killed in Afghanistan since 2001 have been killed by roadside bombs. Thousands of Afghans have also been killed by the devices.

With files from The Canadian Press