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CORAL GABLES (CBSMiami) – A makeshift raft caught the attention of construction workers when it washed up behind a mansion in a lavish Coral Gables community Monday morning.

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U.S. Customs and Border Patrol wants to learn whether anyone was on the raft.

“We were thinking, ‘What happened?’ We didn’t know what’d happened.  We were worried, if people were on it or if they were alive,” said Jose Bush.

WATCH Oralia Ortega’s report, click here.

One of the construction crew members busy renovating the home on Arvida Parkway went to check on the raft.

“It had some food and gas on it, but we don’t know what happened to the people,” said Bush.

Coral Gables police found food and clothing on the sinking vessel.

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A relative of the next-door neighbor told police home surveillance video showed two men getting off the raft and onto another boat.

“Right now, we just don’t know if in fact, there was anybody on it,” said Officer Kelly Denham with the Coral Gables Police Department.  Somebody could have gotten on it just to see if there was something on there and just got off.”

Despite attempts to keep the sinking raft intact while removing it from the water recovery crews were not able to do so.

“Because the vessel was an obstruction in the waterway, we removed it out to our motor pool and upon transferring it to our motor pool, that’s when it completely fell apart,” said Officer Denham.

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