The Russian-made Sukhoi Superjet 100 that went down in Indonesia on Wednesday slammed into a steep mountainside outside the capital Jakarta, RIA Novosti reported citing Indonesian television.

Pictures broadcast on television showed what is believed to be debris from the Superjet at the crash site on a very steep slope near Mount Salak. Other debris from the plane tumbled down the mountain.

Only small pieces of debris were visible in pictures from the Indonesian aviation authorities shown to journalists.

The plane apparently almost made it over the mountain. The crash site, located at an estimated altitute of 5,200 feet, is just a few dozen meters below the top of the ridgeline at that spot.

The Indonesian aviation authorities have established a field headquarters near the crash site and a search for the flight recorders and debris from the plane is underway.

Russian Prime Minister Dmitry Medvedev has established a commission to investigate the incident, the government press service reported earlier on Thursday.

Deputy Industry and Trade Minister Yury Slyusar will head the commission, which includes officials from the Russian Foreign Ministry and United Aircraft Corporation, the Russian holding that owns Superjet manufacturer Sukhoi.

Indonesian President Susilo Bambang Yudhoyono later authorized formation jointly with Russia of a crash investigation group.

“I have given the order to conduct a thorough investigation of this tragedy,” Yudhoyono told local television. “I cannot say anything about the causes of the incident. I ask that Russian and Indonesian aviation specialists tackle this.”

UAC head Mikhail Pogosyan is due to arrive in Jakarta by 7 pm local time on Thursday. He will be joined later in the day by the head of Rosaviatsia Alexander Neradko and the acting head of Minpromtorg Denis Manturov.

The jet disappeared from radar screens during a demonstration flight near Jakarta on Wednesday. There were 48 people on board, including eight Russian crewmembers and 40 passengers, mainly Indonesians.