Florida ? A total of 64 Cuban migrants intercepted during four separate attempts at reaching the U.S. over three days were returned to their home country Sunday, a U.S. Coast Guard official said.

A crew interdicted the largest group of 29 migrants and two suspected smugglers July 23, Petty Officer Barry Bena said in a news release. The migrants had been aboard a boat about 35 miles south of Dry Tortugas, the uninhabited group of islands south of the Florida Keys.

The previous day, about 75 miles west of the Dry Tortugas, an air crew detected another boat carrying 22 Cubans and two suspected smugglers, Bena said. Also that day, Coast Guard officers found 10 migrants on a small boat about 40 miles south of Islamorada and took them into custody.

On July 21, the first of the four groups was found about 15 miles south of Big Pine Key after someone called the Coast Guard to report seeing four people aboard a small boat.

Sunday, the Coast Guard took the 64 Cubans to Bahia de Cabanas. The agency had turned over the four suspected smugglers to Immigration and Customs Enforcement officials in Key West.

One Cuban was to be taken to Guantanamo Bay.