Reiss Nelson scored a stunning 97th-minute winner as Premier League leaders Arsenal came from two goals down to beat Bournemouth.
Bournemouth had taken the lead after just 9.11 seconds through Philip Billing, and went 2-0 up via a Marco Senesi header.
However Arsenal pulled level with goals by Thomas Partey and Ben White, before Nelson struck.
The winger, making his first appearance since 12 November, slammed in from 25 yards in the seventh minute of stoppage time.