Suspicious envelope ignites in US post office

WASHINGTON - An envelope circulating through the US postal system ignited Friday in a Washington post office, CNN reported.

A worker at the post office detected smoke while sorting mail and tossed the suspicious envelope into a bin as it caught fire, authorities said. No one was hurt, authorities said.

The incident prompted concerns following two similar cases Thursday in nearby Maryland. Two separate packages ignited in state government buildings, one a mailroom in the capital Annapolis and another at the state transportation headquarters in Hanover.

Two postal employees suffered minor burns in the Maryland incidents.