Ryan Lochte's Olympic Teammates Detained in Brazil

10:30 PM PT -- A rep for the USOC says Conger and Bentz have both been released by local authorities ... but will remain in Brazil to continue discussions on Thursday, along with James Feigen, who the rep says is also in contact with investigators.

Team USA swimmers Jack Conger and Gunnar Bentz -- who were with Ryan Lochte during the alleged robbery in Rio -- got yanked off an airplane as they were trying to leave Brazil.

The USOC confirms to TMZ Sports ... Conger and Bentz were detained by authorities, but says it's still gathering information as to find out exactly why.

Earlier on Tuesday, cops in Rio said they were suspicious of the swimmers' claim they were robbed at gunpoint early Sunday morning. The USOC says cops went to the Olympic Village to interview Lochte and teammate James Feigen, but discovered they'd already left -- Locate's actually back in the States.

NBC says Feigen was slated to be on the same flight with Bentz and Conger, but never showed up.

Looks like they nabbed Conger and Bentz at the last possible moment. Late Wednesday night, cops were still interviewing them at the airport.