An Arlington woman allegedly pulled out a small pocket knife on an MBTA bus in East Arlington last Friday afternoon and used it to intimidate her fellow passengers, including middle school students.

The passengers told police that the woman, who police identified as 54-year-old Deborah Canejo, pointed the knife at them and glared at them. One witness said Canejo told an individual to “get off the bus” and then said something to the effect of “go back to where you belong.”

Canejo was arrested shortly after the incident at about 3 p.m. Friday, Jan. 25, and charged with assault with a dangerous weapon.

After receiving a call, police stopped the bus, which was heading toward Cambridge, near Mass. Ave.’s intersection with Egerton Road.

After being handcuffed on scene, Canejo told police that she was just filing her nails, but this statement was disputed by multiple witnesses, police said.

The driver said he was unaware of the situation, as Canejo was sitting behind him and out of view. There were cameras on the bus, he told police.

MBTA Transit Police soon arrived on scene and took custody of Canejo.