Boko Haram Islamists opened fire Friday on security operatives conducting an operation near a legislative building in Nigeria's capital Abuja, sparking a gunfight that injured several people, the intelligence branch said.

"In the early hours of (Friday)... a security team went for an operation behind the Apo legislative quarters... they came under heavy gunfire attack by ... Boko Haram elements," leading to a shootout which injured "some people", Marilyn Ogar, spokeswoman for the Department of State Services, said in a statement.

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