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SAN DIEGO, California (CNN) -- A grandmother, mother and young child died when a military fighter jet crashed into a house in San Diego, California, on Monday, igniting a huge fireball, authorities said.

Another child is missing, officials said. A search ended at nightfall Monday but will continue Tuesday morning, a representative for the medical examiner said.

The father is a businessman who was at work at the time of the crash and was not reached for comment, according to the San Diego Union-Tribune.

The F/A-18D plane, which authorities described as disabled, was trying to land at Marine Corps Air Station Miramar.

The jet had just performed landing training on a Navy aircraft carrier before the pilot reported having trouble, according to the Marine Corps. See satellite photo showing crash site, airfield »

"It was, oh gosh, maybe a couple of hundred feet off the ground. And it was quiet -- I think the engine was off," said San Diego resident Ian Lerner, who was heading to lunch at a shopping center about a half-mile from the neighborhood of about 20 homes when he saw the jet flying low. iReport.com: See Lerner's photos

"Then all of a sudden, we saw the canopy of the jet explode and go up, and then we saw the pilot blast out of the plane and the parachute open," Lerner said.

Another witness said the jet was flying at a low altitude, and "just spiraled, right out of [the movie] 'Top Gun.'" Watch witnesses describe the scene »

The house was destroyed. A photograph taken at the scene showed the pilot, who ejected safely, sitting on the front lawn, making a call on his cell phone. He was taken to the hospital, the Marine Corps said in a written statement Monday. Watch burning debris near crash site »

The pilot, whose name was not released, was the only occupant of the two-seat aircraft, according to the Marine Corps.

The Union-Tribune spoke with Steve Diamond, a retired naval aviator, who said he found the pilot in a tree behind a house. He told the paper he helped the man, who Diamond said was a lieutenant in his 20s, down from the tree.

The pilot told him that after he lost power in one engine, it was decided he would try to get the jet to Miramar on the single working engine, Diamond told the paper.

The pilot was in communication with military air traffic controllers before the jet crashed, and the crash site is about two miles from the airfield, the Federal Aviation Administration said.

According to the Los Angeles Times, the pilot ejected moments before the crash and landed without injury in a tree about two miles from Miramar. Jason Widmer said he talked to the pilot, who said he had tried to steer the jet from the homes and into a brushy canyon.

He was pretty shook up and pretty concerned if he had killed anyone," Widmer told San Diego 6. "He had seen his bird go into a house."

A retired general, a pilot who has flown for 40 years and more than 270 missions in Vietnam, said the decision to eject is up to the pilot. F/A-18D planes are very dependable, but any aircraft is given to error.

That model has two engines, and it can operate with one engine fine. But if one engine malfunctions, it's possible that a blade can break off and fly into the other engine, causing it to malfunction, too. If both engines are inoperable, and the plane descends below 10,000 feet, it's likely the pilot will soon lose control.

When the pilot pulls a ring-like lever between his legs, a series of automatic actions is set off: The pilot's harness comes loose, and he is pushed through a canopy, which is rigged to facilitate him breaking through it without causing injury. A pilot can opt to manually activate his parachute, but if he doesn't, the parachute will open on a timer.

The plane would crash randomly once the pilot is no longer in control.

Burning debris scorched two additional homes, and a piece of the jet struck another home. "This could have wiped out half a dozen homes, depending on how it landed," said Maurice Luque, a spokesman for the San Diego Fire-Rescue Department. See photos of fiery crash site »

Inside one of those houses, Robert Johnson sat in his living room with his daughter, Heather Certain, and her 2-year-old son, Nicholas, according to the Union-Tribune. They heard the explosion, then saw a giant fireball in the picture window facing their front yard, the newspaper reported. They ran out of the house. Watch aerial footage of crash site »

"The house shook like an earthquake," Johnson said. "I saw the flames right there in front of my house."

iReporter Chris Morrow of San Diego said she went to the crash site Monday and saw "two houses that looked like they'd blown up."

The Marine Corps said it is investigating what went wrong with the plane. The military has jurisdiction over the crash site. iReport.com: Smoke rises from fiery crash