Fans staged a massive protest in, out and over the Hawthorns against arsene wenger who saw his side lost 3 – 1 to West Brom.
Defender Craig Dawson netted a headed brace to pile further pressure on arsene wenger.
The lost was the Gunners fourth defeat in their past five Premier League outings which leaves them in fifth place, five adrift of Liverpool.
Dawson was left unmarked in the box to score the opener before Alexis Sanchez fired a 15th minute equaliser – his 22nd goal in all competitions this season – from a cross field pass from the impressive Granit Xhaka.
Albion substitute Hal Robson-Kanu, released by the Gunners as a schoolboy, restored the lead 10 minutes after half-time when he poked home a loose ball in the box.
Liverpool are five points better off in fourth, while sixth-placed Manchester United can leapfrog them with victory at Middlesbrough on Sunday.