THE government is facing calls to investigate the use of British-made tear gas to crack down on protests in Oman. 

A rare wave of demonstrations against corruption and unemployment in the Gulf tyranny in recent days has been met with tear gas and other weapons fired by Omani riot police. 

Campaigners are calling for an investigation after images were posted on social media by investigative journalist Phil Miller appearing to show that canisters made by PW Defence, an arms manufacturer based in Derby, were used against demonstrators.