Afghanistan ? A suicide car bomber killed 38 Afghans at a crowded market Monday, pushing the death toll from two days of militant bombings to about 140.

The marketplace blast, which targeted a Canadian army convoy, came a day after the country’s deadliest insurgent attack since a U.S. invasion defeated the Taliban regime in late 2001. The toll from that bombing in a crowd watching a dog fight rose to more than 100.

The back-to-back blasts in the southern province of Kandahar could be a sign insurgents are now willing to risk high civilian casualties while attacking security forces.