Rep. Bae Hyun-jin sustained a head injury after being attacked by an unidentified assailant Thursday but remains in stable condition

The incident happened around 5 p.m. in the southern Seoul district of Gangnam

A male pedestrian walked up to Bae and asked, "Are you the lawmaker Bae Hyun-jin?" and struck her in the back of the head with a rock the size of an adult man's fist.

The suspect was momentarily arrested by police in Gangnam, and claimed to officers that he is 15 years old.