US President Donald Trump on Monday said gun laws in Texas saved lives when a church security officer shot dead a gunman who killed two during a service. The Sunday shooting at a church service in the Fort Worth Suburb of White Settlement was the latest attack on a house of worship in the US. "It was over in 6 seconds thanks to the brave parishioners who acted to protect 242 fellow worshippers. Lives were saved by these heroes, and Texas laws allowing them to carry arms!" Trump tweeted.