A couple were dead and their two children were wounded in an early morning shooting in the U.S. city of Houston Monday, local media reported. The incident happened around 6:15 a.m. CST in a two-storey home in southwest Houston. A husband and wife were pronounced dead at the scene, and their 11-year-old son and 15-year-old daughter were wounded, the Houston Chronicle reported. Investigators are still trying to piece together what happened exactly. There was no sign of forced entry into the home. Police believed altercations between the couple led to the shooting. But it's unclear who drew the weapon. The kids' conditions are not immediately known. No other details are available now.