(Reuters)  A gunman shot dead about 20 people and injured 42 others in a crowded gay nightclub in Florida early on Sunday before being killed by police in what U.S. authorities described as a “domestic terrorism incident”. A police officer working as a security guard inside the Pulse club exchanged fire with the suspect at about 2 a.m., police officials said. A hostage situation quickly developed before a squad of officers entered the club […]