A man who robbed a bank Monday caused a two-hour lockdown of at least three nearby schools as police investigated whether he also left a bomb at a teller’s window before he fled.

A “suspicious item” dropped into the teller’s window at the Chase Bank, 3012 Government St., at 9:40 a.m. was destroyed by the Baton Rouge Police Department’s explosives unit and rendered safe, said agency spokesman Cpl. Don Coppola.

The robber — described as a 40-something black man standing about 6 feet tall in a green flannel shirt, green pants, green beanie cap and brown boots — took an undisclosed sum from a cashier after dropping a note and the object, which appeared to be an older model cellular phone, Coppola said.

Baton Rouge Magnet High School and two private schools, Catholic High School and St. Joseph’s Academy, were on lockdown beginning around 10:30 a.m. following a request from police.

Students at the private institutions were locked inside their classrooms and not allowed to go to lunch or switch classes until the shelter-in-place order was lifted about 12:30 p.m., said Catholic High spokeswoman Samantha Murray and St. Joseph’s representative Mindy Averitt.

Baton Rouge High students were allowed to walk to classes without leaving the buildings, said East Baton Rouge Parish school system spokeswoman Adonica Pelichet Duggan.

Baton Rouge Police were still at the scene about 1:15 p.m.

Anyone with any information about the incident may contact the Armed Robbery Division at (225) 389-3845 or Crime Stoppers at (225) 344-7867.