Two people robbed a mail carrier in Billerica on Tuesday, authorities said. Billerica police said in a statement that two people, both wearing masks, approached a mail carrier in the area of Pages Court around 1:30 p.m. on Tuesday. The suspects were armed with a handgun, according to the statement.

A Billerica elementary school was placed on a brief lockdown after two suspects allegedly robbed a letter carrier at gunpoint on Tuesday.