BAGHDAD – Insurgents sent a bloody message on the eve of the 10th anniversary of the U.S.-led invasion, carrying out a wave of bombings across the country Tuesday that killed at least 65 people in the deadliest day in Iraq this year.

The nearly 20 attacks, most of them in and around Baghdad, demonstrated in stark terms how dangerously divided Iraq remains more than a year after American troops withdrew. More than 240 people were reported wounded.

It was Iraq’s bloodiest day since Sept. 9, when an onslaught of bombings and shootings killed 92.