NEW ORLEANS — The Coast Guard says it has reopened a stretch of the Mississippi River in southeastern Louisiana that was shut down as a precaution after a tugboat sank.

The Mississippi from its mouth to mile-marker 10 was reopened Sunday evening to alternating one-way vessel traffic after no navigation hazards were detected. The Coast Guard announced the reopening in a news release. It was unclear when the stretch of river would be open to two-way traffic.

Authorities are still searching for the 48-foot tug C-Pec, which sank Saturday afternoon. The cause isn't known. Two people aboard were rescued.

River traffic was halted in both directions and at one point Sunday afternoon at least 50 vessels were waiting to travel.