A man was stabbed inside a Bronx subway station during the Tuesday morning rush, police said.

The attack happened just after 9 a.m. on the mezzanine level of the East 180th 2/5 station, police said.

It was unclear if the victim knew his attacker, who was busted at the scene, authorities said.

A photo posted to Twitter shows horrified bystanders standing over the unidentified victim — his shirt and jeans soaked with blood — as a police officer helps tend to his wounds.

The victim was transported to St. Barnabas Hospital in stable condition, according to cops.