Four people killed, five rescued and at least 30 people missing after a fire broke out on a charter boat early Monday morning off Santa Cruz Island, in Southern California.

On the devastating fire news, across the Ventura County coastline authorities said the exact number of fatalities is still unknown.

At 3:15 a.m., the U.S. Coast Guard and Ventura County Fire Department crews rushed to the spot following a call that “Conception,” a charter dive boat with 39 people, was ablaze 20 yards off Platts Harbor.

The 75-foot-long boat was located north of Santa Cruz Island, 30 miles west of the city of Ventura.

Per California news, what sparked the boat blaze remains unknown.

Harbor patrol officer, Nathan Alldredge said authorities responded to a call for rescue support before 4 am. 

What the fire crew saw on arrival was “at least 30 passengers on board and the boat fully involved in flames.”

According to reports, Conception is owned by Truth Aquatics, a boat rental service in Santa Barbara. The company's website said Conception left Saturday on a three-day cruise and was expected back on Monday.

Santa Cruz Island is one of eight islands in the Channel Islands off the coast of Southern California which also comprises Catalina Island.

A tweet by President Donald Trump that made the Trump news on the boat fire stated that he had been briefed on the incident and more support for rescue is on.

Crew safe but passengers missing

According to Coast Guard Capt. Monica Rochester, crew members jumped off the burning boat.

“The crew was already awake and on the bridge and they jumped off,” Rochester said.

A passing good Samaritan boat called the “Grape Escape,” saved five crew members aboard while 34 passengers are still untraced.

The passengers were all below deck at the time and asleep, Rochester said. Although Ventura County Fire crews tried to douse the blaze, the boat sank in 64 feet of water, about 20 yards offshore.

The boat’s operator Truth Aquatics has a 4.5 rating on Trip Advisor.

Four bodies recovered, says Coast Guard update

Around 11 a.m., the Coast Guard told the Associated Press that four bodies had been recovered near the burned-out boat, and 30 people are still to be accounted for.

The Coast Guard is searching the area with choppers and boats for possible survivors.

Family members of those aboard the board can contact the Coast Guard at 833-688-5551 or 805-696-1188.