LAFAYETTE — City police continue to investigate the Monday morning bank robbery at Regions Bank, where a man left behind a suspicious package after fleeing the bank with an undisclosed amount of cash, an official said.

The robber is described as a white man, believed to be in his 50s or 60s, about 5 feet, 5 inches tall, with a medium build and wearing a black cap, said spokesman Cpl. Paul Mouton.

The man entered the bank’s branch at 5711 Johnston St. about 11:30 a.m., demanded cash, then left behind a suspicious package that was investigated as a possible bomb threat, Mouton said.

“He used threatening language with the clerk and then left the package,” Mouton said.

Lafayette police, Lafayette Haz-Mat, State Police, ATF and FBI responded to the scene.

As a precaution, officials closed portions of Johnston Street between Duhon Road and Ambassador Caffery Parkway, Mouton said.

State Police rendered the device safe at 2:43 p.m., Mouton said, declining to elaborate as to how the package was handled.

At that time, a loud bang coming from the direction of the bank could be heard from the parking lot of nearby Barnes and Noble.

Employees from businesses around the bank, such as Starbucks, T-Mobile and Tampico, were allowed to return to work about 3 p.m.

Soon after, police reopened the northbound lane of Johnston Street, Mouton said.

Police continue to investigate the robbery and are asking anyone with information about the incident or the suspect to call Crime Stoppers at (337) 232-TIPS.