Three police officers killed in US

The latest shooting in the United States has claimed the lives of three police officers after a rampage in New York State killed 14. 

The incident happened in Pittsburgh, Pennsylvania where a gunman wearing a bullet-proof vest opened fire on the officers. 

Police Chief Nathan Harper said the motive for the shooting is not clear but friends said the killer had been upset about losing his job and feared the Obama administration was planning to ban guns. 

The gunman identified as Richard Poplawski was wounded in the battle and surrendered. 

The three dead officers were named as Eric Kelly, Stephen Mayhle and Paul Sciullo III. 

Two other officers were also wounded in the shooting. 

The shooting occurred just two weeks after four police officers were fatally shot in Oakland, California.