NEW YORK — A New York City police officer who suffered a serious head wound after being attacked by a hatchet-wielding man remains in critical but stable condition, police said Friday. Police say another officer who was hit in the back of the head in the Thursday attack is in stable condition on Friday. The attacker was shot and killed by police. Security videotape and witness accounts appeared to leave no doubt that the man purposely targeted four rookie New York Police Department officers, police said.