A plane went into the St. Johns River on Friday night, Jacksonville Mayor Lenny Curry said.

“I’ve been briefed that all lives have been accounted for,” the mayor tweeted.

A spokesman from the Naval Air Station Jacksonville said a Boeing 737 slid off of a runway into the St. Johns River at 9:40 p.m. ET. The station told CNN affiliate WJXT that the plane appears to have skidded off the airport runway while trying to land and ended up in the river.

The station said the plane was arriving “from Naval Station Guantanamo Bay, Cuba into Naval Air Station Jacksonville ” and crashed into the river at the end of the runway.

“Navy security and emergency response personnel are on the scene and monitoring the situation,” the station said.

The Jacksonville Sheriff’s Office said in a tweet the plane was in “shallow water,” and was “not submerged.“

#JSO Marine Unit was called to assist @NASJax_ in reference to a commercial airplane in shallow water. The plane was not submerged. Every person is alive and accounted for. pic.twitter.com/4n1Fyu5nTS — Jax Sheriff's Office (@JSOPIO) May 4, 2019

The sheriff’s office also said “every person is alive.“

Curry said fire and rescue crews were on the scene.

“While they work please pray,” he wrote.

This is a developing story.

Stay with News 3 for updates.