Authorities have evacuated a large part of downtown Baltimore after a van loaded with more than 1,000 gallons of gasoline was found abandoned in a parking garage on Monday, according to local media reports.

Police received the call about the suspicious vehicle in the garage of an office complex that is home to T. Rowe Price, one of the city’s largest private employers, around 11 a.m. and immediately evacuated thousands of workers, sparking fears of a terror attack, the Baltimore Sun reported.

Garage security later smelled gasoline and called police, NBC affiliate WBAL TV reported.

Bomb technicians in protective suits entered the building around 12:49 p.m. before Mayor Bernard C. Jack Young Jr. gave the all clear around 4 p.m.

Young announced authorities found no bomb threat but said a large exclusion area covering four city blocks would remain in place as they sweep the area and investigate.

“We are asking everyone to remain clear of the evacuated area,” Young tweeted. “Those who have a vehicle parked in the evacuated area, we ask that you please find alternative transportation home.”

Staff in the nearby Transamerica building were first warned of the suspicious vehicle around 11 a.m. before alarms sounded and everyone was forced to evacuate 30 minutes later, one employee told the Sun.

“You’re wary because we’re in a tall high rise just like on 9/11 and just two days away,” said Nicole Gilmore, a 42-year-old receptionist at the Baker Donelson law firm.

“When you hear something like that you don’t want to think the worst but you do,” she said.

The evacuation zone later expanded near the Inner Harbor, including The Gallery shopping mall, the Renaissance Baltimore Harborplace and Brookshire Suites hotels.