A gunman in Houston shot four people, killing two of them and injuring the others, Thursday.

According to the Houston Police Chief Art Acevedo, the shooting happened at around 4:50 p.m. local time (5:50 EST) in Eastbrook Drive. He said two groups of people had an argument a few days ago and decided to meet at the location Thursday. As the groups arrived, a gunman who was on top of a building nearby opened fire with a high-powered rifle.

Four people were hit by the gunfire. One of them, an 18-year-old boy, died at the scene and a 21-year-old man succumbed at a nearby hospital. Another boy was shot and was taken to a nearby hospital in critical condition. He was undergoing surgery while an 18-year-old woman was injured in her knee.

The police received a 911 from someone who said a group of people were shooting at each other in front of the person's house and one was already on the ground.

The identities of the victims were not verified yet. The suspect was on the run and police don't have any information on him.

Acevedo told the media the youngest person among the two groups was 17. “A member of the other party was lying in wait. The suspect was on the rooftop of a house that was flooded out. That coward shot these young people like they were deer,” he said while reassuring the people of Houston the police will catch the shooter.

Meanwhile, Houston police were also investigating another shooting that took place in Dunlap at around 6:40 p.m. Wednesday. One male was killed and another was seriously injured in the incident. Officers were called to a parking lot in Dunlap where two groups were involved in a fight. Police said the argument escalated resulting in the shooting.

Dispatchers who reached the scene said two persons were fighting at the bottom of a stairwell when the shooting began. They found the body of an 18-year-old boy in the parking lot while the other boy, who was shot in the stomach, was taken to a hospital. He is expected to survive.

Both the victims weren’t involved in the fight and were just bystanders. Police said a couple of the bullets also went into the neighboring apartment where a baby was sleeping.

Identities of both the victims were not revealing as the investigating was on. The number of shooters involved was also unknown.