Brazilian authorities say all of the 155 people aboard a passenger jet that crashed in the country's remote Amazon jungle Friday were killed.

Air force officials say troops searching the wreckage have recovered the first two bodies, and report no signs of survivors. Troops are still looking for flight data recorders.

Officials believe the Gol Airlines Boeing 737-800 clipped a business jet before it plunged nose-first into the dense northern jungle, about 1,000 kilometers northwest of Rio de Janeiro. The smaller aircraft made an emergency landing, and no one aboard was injured.

Authorities say the Gol Airlines crash is the worst air disaster in Brazilian history.

Sunday, President Luiz Inacio Lula da Silva declared three days of national mourning.

The Gol flight originated in the city of Manaus and was bound for the capital, Brasilia, when it crashed.

Some information for this report provided by AP, AFP and Reuters.