Another 10 people in Florida have been confirmed dead in the wake of Hurricane Michael, bringing the number of storm-related deaths to at least 29 as rescue workers try to reach hundreds more people whose whereabouts is unknown.

Michael, which made landfall on Wednesday as one of the most powerful storms on record to hit the continental United States, has killed 20 people in the Florida Panhandle, five in Virginia, three in North Carolina and one in Georgia, according to official tallies.

Teams from volunteer rescue organization CrowdSource Rescue were steadily making contact with people flagged by friends and relatives in the Panhandle disaster zone, according to Matthew Marchetti, co-founder of the Houston-based group. Volunteers still had not reached more than 1,135 people on Tuesday morning.