Luke Barr/ABC News (WASHINGTON) -- Secretary of Homeland Security Alejandro Mayorkas is warning Americans about the dangers of drones along the U.S.-Mexican border and urging Congress to expand the department's drone defense capabilities in the interest of national security. The secretary recalled specific incidents when drones have posed a threat in the United States, citing an incident earlier this month in Pittsburgh in which a drone grounded all flights for 30 minutes -- one of 2,300 incidents involving drones in the past two years he said that disrupted prearranged flight schedules, he said in remarks to congressional staffers at DHS headquarters.

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