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Several streets in Canonsburg were cordoned off in the search for the gunman.

SWAT officers were reportedly at the scene after one of the officers was confirmed dead.

The identity of the shooter remains unknown.

(Image: TWITTER/REUTERS)

Mayor Dave Rhome has since confirmed the incident.

It comes as millions riot across America to protest against the election of Donald Trump.

Dozens of pro-Clinton supporters have been arrested with horrific pictures emerging showing American flags burned, windows smashed and bloody clashes with riot cops.

Thousands of angry protesters filled the streets of New York last night as they stormed towards Trump Tower chanting "f*** Trump" and "not my president".

Meanwhile, five people – three men and one woman – were shot near an anti-Trump protest in Seattle, Washington state.

One officer was flown to a Pittsburgh hospital and the other was taken by an ambulance to Canonsburg Hospital.

Schools in the area were placed on a two hour delay.

And local residents were advised to avoid the area at all costs.