A cordon is set up and close-by structures have been emptied, Wiltshire Police said.
Volunteers from the British Red Cross are supporting those influenced and brief overnight convenience is being orchestrated a few inhabitants.
Supt Phil Staynings said the examination was in the “beginning periods”.
“At this stage, we can’t decide the reason for the blast however our examination will proceed for the duration of the night.
“We might want to thank nearby organizations who have given refreshments, haven and convenience amid the night and in addition volunteers from the British Red Cross who are supporting anybody influenced.”