A car tried to ram the White House security barriers close to the US Capitol building at 15th Street NW and Pennsylvania avenue.
Marking 'A' on the map shows where the incident is thought to have happened.
Police chased the vehicle for about one and a half miles to 2nd Street and Constitution Avenue, near the Capitol, where the shots were fired.
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The twin brother of the police officer shot and blinded by gunman Raoul Moat says his family are still waiting for justice five years later.
The success of the No camp is mainly due to Tsipras convincing people a No vote will strengthen their hands in negotiations.
As we move into the weekend, expect things to get rather more unsettled weather-wise - thought it will stay hot and humid for some.