The attacks in France committed by Mohammed Merah, a French-born Muslim whose parents migrated from Algeria, have millions of Muslims living in the West worried about the potential consequences. In particular, women worry that they will become the focus of campaign politics.

Many friends who wear the hijab and live in Europe reported getting angry looks after the attacks, said Malika, 29, a German of Moroccan background who works in a bank and declined to have her last name published.

Mr. Merah, 23, had traveled to Pakistan and Afghanistan and claimed affiliation with Al Qaeda. He killed seven people, three of them children.

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