U.S. Muslims are seeing a spike in hate calls and are concerned about possible retaliatory attacks on domestic mosques following the fatal attack on the U.S. consulate in Libya and protests at the U.S. Embassy in Cairo.

"We're starting to get hate calls and we'd already seen a wave of anti-Muslim incidents," Ibrahim Hooper, spokesman for the Council on Arab-Islamic Relations in Washington, D.C., told NBC News on Wednesday.

"Our first thought is condemning the attacks. Obviously this is something we're concerned about," he said. Muslims are feeling insecure, he added.

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