Reuters reports that some 8,000 people were driven from their homes in the Boston suburbs by a series of gas explosions.
It was unclear on Friday when they could go back.
The blasts killed at least one person, injured 12 more.
It destroyed dozens of homes and other buildings in Andover, North Andover and Lawrence on Thursday.
Andrew Maylor, the town manager of North Andover, said on Twitter, residents who were evacuated “should expect that the restoration process will take several days or longer."
Firefighters raced for hours from one blaze to another and utility crews rushed to shut off gas and electricity to prevent further explosions.
Officials said fire and utility crews were going door to door to conduct safety checks.
Massachusetts State Police said some 70 fires, explosions or investigations of gas odor had been reported.