An 18-year-old white gunman has opened fire at a supermarket in a Black neighbourhood in the US city of Buffalo, killing 10 people in what authorities called an act of "racially motivated violent extremism".

The gunman was armed with an assault-style rifle and wearing body armour. He was arrested peacefully after the shooting spree.Police officials state that he drove for hours to Buffalo from his home in a New York state county, to launch the attack which he broadcast on the internet. The N-word' could visually be seen on the gun itself from the angle he recorded from.A timeline of events as per The NY Times is as follows:The shooting began in the parking lot. At about 2:30 p.m. on Saturday, after driving from hours away, a heavily armed man appeared outside a Tops supermarket. He was wearing tactical gear and body armor, with a video camera fixed to his helmet. He was carrying an assault rifle, with an anti-Black slur written on the barrel.

Then he opened fire.

Three of his victims outside were killed, the police said later. One was wounded.

Then he entered the busy grocery store and continued his rampage, broadcasting the footage live online.

A retired Buffalo police officer who was working as a security guard fired multiple shots at the gunman. The authorities said that the suspect was struck but was wearing body armour and managed to return fire, killing the security guard.

He shot shoppers and employees, according to the police, leaving a trail of bodies in the aisles.

Eventually, the gunman returned to the front of the store, where he was confronted by Buffalo police in the vestibule. He then put the gun to his own neck.

Two patrol officers on the scene persuaded the gunman to drop the gun, Mr. Gramaglia said. He began removing some of his tactical gear in surrender, according to officials. Then the police tackled him and further arrested him.