Authorities evacuated a busy terminal at LaGuardia Airport after receiving reports of a potentially suspicious package in a shopping area, law enforcement officials said.

Officials gave the all-clear about 30 minutes later, and passengers were allowed back into the terminal.

Travelers tweeted photos of hundreds of people outside with their luggage after Central Terminal was evacuated shortly before 11 a.m. Tuesday.

New York City has been in a state of heightened alert since two bombs exploded near the finish line of Monday’s Boston Marathon, killing at least three people and injuring more than 170 others.

(Source: NBC New York)