Police are investigating a traffic accident in Tsuen Wan on Tuesday afternoon that left 22 people injured.

Officers said they received a report at 5:47pm that a coach, carrying 26 passengers, had smashed into a road divider and flipped over on Texaco Road.

The 22 people injured were aged between 20 and 70. Most suffered only minor injuries although four of were seriously hurt.

"The Traffic New Territories South is investigating the accident. We will look into the driver's driving behaviour, his mental condition and the performance of mechanical parts," chief inspector Lau Kam-pan said.

Traffic gradually returned to normal after the coach was towed away at about 8pm.