Two children were killed and two others critically injured in a shooting early Saturday near the Houston suburb of Angleton, authorities said. The Brazoria County Sheriff’s Office reported in a Facebook post that deputies responding to the scene found two children, ages 13 and four, fatally shot. Two additional children, aged eight and nine, were airlifted by medical helicopter to a hospital and were in critical condition. “All people believed to be involved in the shooting have been detained,” the sheriff’s office said. “There is no ongoing threat to the community.” Officials have not released further details regarding the location of the shooting or the circumstances leading up to it. Phone and email messages to several county spokespersons were not immediately returned. “While details are still developing, the loss of two children in such a manner is a tragedy,” the sheriff’s office wrote in the post. “Our thoughts are with the family and everyone affected as we continue to learn more about this heartbreaking situation.” Angleton, the seat of Brazoria County, is a city of approximately 19,500 residents, located around 45 miles (72 km) south of Houston. The city is part of the Houston–The Woodlands–Sugar Land metropolitan area.