The gunman behind the Orlando nightclub shootings, the deadliest mass shooting in American history, recently scouted Walt Disney World as a potential target, a federal law enforcement source tells PEOPLE.

Omar Mateen and his wife, Noor Zahi Salman, visited Walt Disney World in April, the source says. Salman told federal authorities on Sunday that her husband had more recently been “scouting Downtown Disney and Pulse [nightclub] for attacks.”

Unlike the four Disney World theme parks, Downtown Disney, which was recently renamed Disney Springs, doesn’t have security and bag check before entry.

Metal detectors have been installed outside Magic Kingdom, Hollywood Studios, Animal Kingdom and Epcot since 2015 and guests are selected at random for screening.