HARBIN - Overloaded vehicles were confirmed to have caused the collapse of a ramp leading to a bridge in Harbin in Northeast China's Heilongjiang province in August, the investigation team said Wednesday.

The investigation and evidence show that overloaded trucks caused the Yangmingtan Bridge on-ramp collapse that left three dead and five others injured early in the morning of August 24, according to the team that investigated the accident.

Four trucks fell about 30 meters to the ground.

The ramp was constructed within a period of 90 days at a cost of 7.09 million yuan ($1.13 million).