Four people were killed Wednesday when their small aircraft crashed and burst into flames near the western city of Gracias, Honduran authorities said.

The accident occurred the same day that President Juan Orlando Hernandez traveled to Gracias - his home town - to inaugurate a new airport.

"Deeply moved for the victims of the air accident, may the presence of God be a balm for their families in these difficult moments," the president said on Twitter after learning of the crash.

Killed were student pilot Hamilton San Martin and all three passengers: Doris Guillen; Lilian Isabel Mondragon; and the second woman's son, Franco Jose Diaz, fire rescue officials said.

Authorities are trying to determine the cause of the accident, Honduras' civil aviation director, Col. Jose Navarro, told reporters.

"The plane was not flying overloaded and we don't know what happened," he said. EFE