ST. LOUIS (AP) — The Coast Guard says it may be days and perhaps weeks before a towboat that sank in the Mississippi River at St. Louis with 10,000 gallons of diesel fuel can be brought to the surface.

The 70-foot, 140-ton Jim Marko went under Tuesday near the Stan Musial Veterans Memorial Bridge after four crew members were rescued unharmed. A pollution-control team is on standby to deal with the possible seepage of the boat's cargo.

Messages left Wednesday with the vessel's owner, Mike's Marine, and operator, Osage Marine Inc., weren't immediately returned.

The Coast Guard closed a several-mile stretch of the river just north of the sunken towboat for about five hours Tuesday.

The Coast Guard says salvage efforts will be delayed until the river's currents and high levels subside.