The Transportation Security Administration announced Monday that it has stepped up screenings of remote-control toys in carry-on luggage.

Though the increased screenings are not tied to a specific terrorist threat, "TSA is aware that remote control toys can be used to initiate devices used in terrorist attacks," the agency said Monday in a press statement.

The TSA is increasing screenings of the toys in part because of the National Intelligence Estimate in July, which outlined possible methods of terrorist attacks.

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Last month, court documents revealed that a University of South Florida engineering student facing a terrorism-related charge made a video showing how to detonate explosives using a remote-control toy.

An FBI agent said in a sworn statement that Ahmed Abdellatif Sherif Mohamed told authorities he made the video "to assist those persons in Arabic countries to defend themselves against the infidels invading their countries."

Documents show that the demonstration was uploaded to a popular Web site before the Egyptian man was arrested near a Naval Weapons Station in Charleston, S.C.

Mohamed and Youssef Samir Megahed were indicted last month on federal charges of transporting explosives across state lines.

Both men are engineering students at the University of South Florida.

The Associated Press contributed to this report.