A 13-year-old boy is dead and another male is in critical condition after two separate subway surfing incidents in the Bronx, according to the NYPD.

Police say the 13-year-old victim was subway surfing from the Middletown Road station just before 9 a.m. on Friday. The teenager was found at the scene near that subway station and was pronounced dead.

In the second separate incident, police say that a male of unknown age was riding on the roof of the subway near the Morris Avenue-Soundview station on a northbound 6 train just before 1:45 a.m. on Friday. First responders brought the victim to Jacobi Hospital, where he is currently in critical condition.

Law enforcement officials say the investigation into these two incidents is ongoing at this time.

NYC Transit Interim President Demetrius Crichlow also released the following statement:

“These incidents are tragic reminders that riding outside of subway cars is extremely dangerous, not a cheap thrill. We continue to mount an information campaign that includes teens speaking to teens about the risks of riding outside subway cars.”