Nine people injured in an arson attack on a train in Hong Kong on Friday remained in the hospital on Saturday, according to Secretary for Food and Health Ko Wing-man.

Eighteen people were injured in a deliberately lit fire on an MTR train traveling from Admiralty to Tsim Sha Tsui Station at about 7:15 pm. A 60-year-old man has been arrested for arson. He is believed to have tried to set himself on fire.

Of the nine people still hospitalized, four are in critical condition, including a female tourist from Taiwan and the suspect.