Two subway trains in Hong Kong have collided while testing a new signal system.
According to reports, the incident occurred between the Central and Admiralty stations before the service opened to the public early Monday.
No passengers were on board, but the drivers were taken to hospital.
Authorities have now launched an investigation into the incident.

Russian air strikes kill 10, injure more than 50 in Ukraine's Kyiv
US, Iran talks conclude in Doha, focused on Strait of Hormuz
Trump honours Theodore Roosevelt in North Dakota, debuts new Air Force One
Kenyan court charges 8 schoolgirls with fellow students' murder
At least 5 people killed in fire in Antwerp apartment block
Three people die in Mexico World Cup celebrations as fans crowd streets
After Venezuela quakes, citizens lead rescues amid military theft accusations
Two dead after wildfire guts house in northern Greece
