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 drone attack on Ukraine's Odesa kills three
US, Iran and mediators make push for 45-day ceasefire
US snatches airman from Iran as Trump, Israel ratchet up pressure
Ships near Italy rescue 32 migrants as 71 remain missing
Nigerian army rescues 31 hostages after church attack