Armed deputy failed to confront gunman

The armed sheriff's deputy assigned to the Florida high school where 17 people were shot dead has resigned rather than face suspension after an internal investigation showed he failed to enter the school to confront the gunman during the attack, the county sheriff said on Thursday.

Deputy Scot Peterson, who was on duty and in uniform as the resource officer posted at Marjory Stoneman Douglas High School, was the only law enforcement officer present on Feb. 14 when the rampage started, Broward County Sheriff Scott Israel said.

Peterson's actions were caught on video during the massacre, which ranks as the second-deadliest shooting ever at a US public school, carried out by a lone gunman wielding a semiautomatic AR-15-style assault rifle.

Nikolas Cruz, a 19-year-old former student, was later arrested and charged with 17 counts of premeditated murder in the assault.

Israel told reporters the shooting in the Fort Lauderdale suburb of Parkland lasted six minutes, and that Peterson reached the building under attack about 90 seconds after the first shots were fired, then lingered outside for at least four minutes.

The shooting has renewed a national debate between proponents of gun rights, as enshrined in the Second Amendment to the US Constitution, and advocates for tougher restrictions on firearms.

High school students from Stoneman Douglas and elsewhere around the country have launched a protest and lobbying campaign demanding new curbs on assault weapons. US President Donald Trump has suggested school gun violence could be abated by arming teachers.