MIAMI — A senior law enforcement official says investigators have released a scientist detained at Miami International Airport after screeners spotted a metal canister in his luggage that looked like a pipe bomb, prompting an evacuation.

The official told The Associated Press on Friday that no charges were filed against the 70-year-old man and he was allowed to continue his trip. He says the man was cooperative. The official spoke on condition of anonymity because he wasn’t authorized to release the information.

Neither the professor’s name nor his itinerary has been released.