KABUL, Afghanistan – Islamic militants sought Tuesday to capitalize on anger over an anti-Islam video that was produced in the United States, saying a suicide bombing that killed 12 people in Afghanistan was revenge for the film and calling for attacks on U.S. diplomats and facilities in North Africa.

The attempt by extremists across the region to harness Muslim fury over a film that denigrates the Prophet Muhammad posed new concern for the United States, whose embassies and consulates have been targeted, and in some cases breached, during riots and protests over the past week.

At the same time, Western leaders welcomed statements by Middle East governments that condemned the violence against diplomatic facilities on their soil, even as they expressed anger over the video. Some of those governments replaced autocratic regimes in popular uprisings that swept the region, allowing for greater leniency toward protest.