The Baltimore-Washington Parkway was briefly closed in both directions Tuesday morning as a medevac unit responded to a single-vehicle crash at Route 197 in Maryland, authorities said.

The accident happened in the southbound lanes just before Route 197. The medevac landed in the northbound lanes around 6 a.m., closing the roadway in both directions for about a half hour.

All lanes have since been reopened.

No details about the crash or possible injuries were immediately available.