Four Cuban migrants swam to shore in the Florida Keys and three others were rescued after their boat sank on Wednesday, shortly before Hurricane Ian made landfall in south-west Florida.
But 20 more might be missing, officials said.
The four Cubans reached Stock Island, just east of Key West, and reported their vessel sank because of inclement weather, the US Customs and Border Protection's Walter Slosar said on Twitter.
The US Coast Guard started a search for 23 people and found three survivors about three kilometres south of the island chain, officials said.
The survivors were taken to a local hospital and treated for exhaustion and dehydration.
Air crews continued to search for the remaining migrants.
The Kites
Romain Gary
Penguin Modern Classics
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European arms
Known EU weapons transfers to Ukraine since the war began: Germany 1,000 anti-tank weapons and 500 Stinger surface-to-air missiles. Luxembourg 100 NLAW anti-tank weapons, jeeps and 15 military tents as well as air transport capacity. Belgium 2,000 machine guns, 3,800 tons of fuel. Netherlands 200 Stinger missiles. Poland 100 mortars, 8 drones, Javelin anti-tank weapons, Grot assault rifles, munitions. Slovakia 12,000 pieces of artillery ammunition, 10 million litres of fuel, 2.4 million litres of aviation fuel and 2 Bozena de-mining systems. Estonia Javelin anti-tank weapons. Latvia Stinger surface to air missiles. Czech Republic machine guns, assault rifles, other light weapons and ammunition worth $8.57 million.