DAR ES SALAAM, Aug. 19 (Xinhua) -- A powerful explosion caused by a collision of two oil tankers burned four vehicles to ashes on Sunday on the Tanzania-Rwanda border, according to Tanzanian police.

Abeid Maige, a police officer in Ngara district, said the explosion, which occurred at Rusumo customs clearance point in Ngara district, Kagera region, was caused when one oil tanker failed brakes and hit the other tanker in the morning. The explosion also burned two other cars that were parked in the area.

Maige said no one was hurt by the explosion. "Following the explosion police worked hard to disperse the crowd and towed the debris of the vehicles away," said him.

Crispin Kamugisha, an eyewitness, said there is a steep slope when entering the parking lot of the Rusumo customs clearance point that causes accidents.

"Surprisingly there is no fire and rescue brigade stationed in the area," said Kamugisha.

Ngara District Commissioner Michael Mtenjele said he has communicated with authorities in Rwanda who promised to bring in a helicopter to extinguish fire in the area.