LONDON (AP) — London fire investigators are painstakingly searching for more victims of an inferno that engulfed a high-rise apartment building and killed at least 12 residents.

Authorities say the death toll is expected to rise as emergency workers sift through more of the wreckage on Thursday.

The fire early Wednesday in the 24-story building in west London's North Kensington district also injured dozens, 18 of them critically, and left an unknown number missing. The cause of the blaze is under investigation, but a tenants' group had complained for years about the risk of a fire.

More than 1 million pounds ($1.27 million) has been raised to help victims of the tragedy as volunteers and charities worked through the night to find shelter and food for people who lost their homes.