(AP) – Investigators combed through wreckage Wednesday for clues to why a business jet crashed on a Texas highway, killing one person on board after its pilots reported mechanical problems while requesting an emergency landing at a nearby airport.

The fiery crash late Tuesday in Laredo near the Mexican border sent bystanders racing from their cars to help police rescue passengers and crew from the burning aircraft. The crash killed Joshua Baer, a leader in Texas’ technology and startup sectors, the president of Baer’s company told the Austin American-Statesman.

Video from the frantic scene showed someone trying to smash the cockpit glass with a sledgehammer, while others used makeshift levers as they worked to open the plane’s door. Local officials said a firefighter entered the smoke-filled jet to extract one person still inside after the rest had escaped.

“While the loss of life is deeply regrettable, it is nothing short of a miracle that this tragedy did not become a mass fatality event,” Laredo Mayor Victor Treviño told a news conference Wednesday.

The cause of the crash was not immediately known. The Federal Aviation Administration was investigating along with the National Transportation Board.

Laredo Police Chief Miguel Rodriguez Jr. said investigators working to reconstruct the crash were at the crash site Wednesday.

Crash victim worked to help entrepreneurs launch startups

Baer was the founder and chief executive of Austin-based Capital Factory, which helps entrepreneurs connect with investors and others to launch their businesses.

“Joshua was a fearless leader, a brilliant partner, and a dear friend to so many of us,” Capital Factory President Bryan Chambers told the Austin newspaper.

Capital Factory executives did not immediately return phone messages Wednesday from The Associated Press.

Baer lived in Austin with his wife and three children, according to his LinkedIn page. He recently taught a student entrepreneur class at the University of Texas at Austin.

“I help people quit their jobs and become entrepreneurs,” Baer said on his LinkedIn page.

In a social media post, U.S. Sen. Ted Cruz of Texas called Baer “one of the most significant figures driving innovation and entrepreneurship across America.”

Police did not release the name of the person killed, citing a request from family members. Rodriguez said those on the plane included two pilots and three teenagers.

Pilots reported low fuel, electrical issues, airport director says

The Cessna Citation Latitude twin jet departed Tuesday evening from the Mexican resort city of San José del Cabo and was bound for Austin, Texas, the FAA said in a statement.

The plane was operated by NetJets, a company owned by Warren Buffett’s Berkshire Hathaway that lets people buy part ownership in private jets. NetJets said in a statement it was cooperating with authorities.

The jet went down at about 10 p.m. Tuesday on the Loop 20 highway, just a few minutes after its pilots radioed the local airport seeking to make an emergency landing. Their call to air traffic controllers “mentioned low fuel and a power outage,” Laredo International Airport Director Gilberto Sanchez said.

“They had mechanical issues and they lost communication with the tower,” Sanchez said Wednesday, “and that’s when the accident happened.”

Dashcam video posted on social media showed the aircraft careening down the highway and knocking down a light post before coming to a stop near the airport. The jet also barreled into a car, sending one motorist to a hospital in stable condition, said Laredo police investigator Jose Baeza.

Video posted to social media showed the plane on its side, smashed into a highway barrier with the tail ripped from the fuselage.

“It looked like part of a movie. I was in shock,” said Zayra Garza, an esthetician who was driving her co-workers home when she came upon the crash.

Garza, who shot video of the scene as her husband ran to help, saw motorists leave their cars to try to help smash the cockpit glass. She said the plane’s door opened and three people who looked like teenagers rushed out, followed by someone who appeared to be a pilot. Another crew member tried to pull out a person who seemed to be unconscious.

Smoke billowed from the plane as a firefighter climbed into the aircraft to rescue the remaining passenger. Police officers helping prop open the door had to back away as they doubled over coughing because of the intense smoke. Police said five officers were treated at a hospital for smoke inhalation.

“What was worrying me was the fire,” Garza said. “I was concerned that it could have just exploded at any time.”

This was the third significant aviation accident in as many days. A B-52 crashed Monday during a test flight at Edwards Air Force Base in California and killed all eight people aboard, while on Sunday, 12 people were killed when a plane on a skydiving outing in Missouri crashed.

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Golden reported from Seattle; Collins reported from Hartford, Connecticut; and Bynum reported from Savannah, Georgia. AP journalists Josh Funk in Omaha, Nebraska, and Jeffrey Collins in Columbia, South Carolina, contributed to this report.