REVERE, MA (WHDH) - Police did not inform residents what was happening when they arrived to Francis St. in Revere at 4:30 a.m.
Police were responding to a 911 call saying they heard gunfire on the 2nd floor of a Francis St. building.
As officers investigated, the swat team was called in and locked down the neighborhood.
Residents were forced to hide inside.
6 people were taken into custody.
Police are not saying exactly what happened this morning, but are saying it is under investigation.
(Copyright (c) 2017 Sunbeam Television. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)