Over 200 people were wounded, including 47 suffering serious injuries, as two metro light rail trains collided in a tunnel in Malaysia’s capital Kuala Lumpur on Monday, media reports said.

The accident happened around 8:30 p.m. local time as an empty train collided head-on with another one carrying 232 people on the Kelana Jaya Light Rail Transit (LRT) line at an underground section near the KLCC station outside the Petronas Towers, media reports quoted Malaysian transport minister Wee Ka Siong as saying.

The minister told a press conference at the station that 166 people suffered light injuries while 47 were seriously injured, adding that some of the injured were sent to the hospital.

The empty train was on a test run, the minister said.

He said the incident was the first of its kind in the LRT’s 23-year history, adding that a special panel will be formed to probe the collision.

Meanwhile, Malaysian Prime Minister Muhyiddin Yassin said on social media that he was informed of the accident and that security and emergency officers are on the scene.

The prime minister said he has ordered an investigation into the accident.