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ABUJA (Reuters) - A Nigerian man accused of trying to blow up a U.S.-bound airplane on Christmas Day had been properly screened by airport authorities before boarding a flight in Lagos, the Attorney General said on Thursday.

A U.S. grand jury on Wednesday indicted Umar Farouk Abdulmutallab on six counts related to the attack on a Detroit-bound airliner from Amsterdam carrying nearly 300 people.

Abdulmutallab had transferred to that flight from a KLM flight from Lagos.

Attorney General Michael Aondoakaa said airport security footage showed the 23-year-old removing his shoes and going through a metal detector at Nigeria's busiest airport.

"The security agencies did all that was required under the law to ensure that Nigeria complied with international standards," he told reporters in Nigeria's capital Abuja.

The government has said Abdulmutallab spent less than 30 minutes in Nigeria during his journey, which began in Ghana.

He did not check in any baggage but was carrying a shoulder bag when he checked in for the KLM flight in Lagos, the head of Nigeria's Civil Aviation Authority said last week.

Aondoakaa invited U.S. authorities to view the footage and inspect security at the Lagos international airport.