Pilot Andrei Postelnicu missing after his twin engine aircraft crashes in St. Lucie Inlet off the coast of Florida.

Search crews continued for the second day looking for a plane that crashed off of the St. Lucie Inlet.

The plane was headed from Marathon to Vero Beach Friday evening.

Authorities say the pilot, Andrei Postelnicu, of the United Kingdom, was the only person in the Piper PA-28 plane.

Authorities say Postelnicu leased the plane from a Treasure Coast company, Pilot's Paradise, and was returning to Vero Beach.

Martin County Sheriff William Snyder says Postelnicu was last heard on the radio asking for some kind of instructions.

Snyder says the plane likely crashed in about 50 feet of water.

The Martin County Sheriff's Office, along with the U.S. Coast Guard, Florida Wildlife Conservation Commission and the Civil Air Patrol have been searching by ground, air and in the water for the wreckage.

The debris field is about 5 miles in length along the coastline between where a shoe and book bag were found, making it difficult to pinpoint the wreckage.

If nothing is found on Sunday, Snyder says The Civil Air Patrol will use SONAR to search the ocean.

All of the property found along the shore Sunday was discovered by beach walkers. That's why the Sheriff's Office is asking people to remain watchful.