Search efforts have been suspended for a car that plunged into the Ohio River after a massive pileup on a bridge leading from Kentucky to Cincinnati.

Campbell County Director of Emergency Management William Turner said Wednesday that water rescue officials say it is unsafe to put divers back into the rising river. He said officials would likely reassess the situation Saturday.

Turner said officials still don't know how many people were inside the car when it toppled over the side of the bridge Tuesday.

Campbell County Police Chief Craig Sorrell said 12 vehicles were involved in four separate accidents at rush hour on the Combs-Hehl Bridge, which carries Interstate 275 from Campbell County, Kentucky, to Cincinnati. Rescue teams from several agencies searched the river for hours immediately following the crash.