It shows an unidentified gunman pointing a pistol at a cab driver, who he then shot three times. Thankfully the driver, Raphael Martinez survived.
The photo was released on the same day President Obama admitted that he may fail in his bid to outlaw high-power assault weapons.
Mr Obama confirmed that he would propose a ban on guns such as that used in the massacre of 20 children at a school in Connecticut last month, but warned that it might be blocked by Congress.
He said he was committed to banning assault weapons, tightening background checks and regulating high-capacity ammunition, as well as other proposals drawn up by Joe Biden, the vice president.
"Will all of them get through this Congress? I don't know," he said at the White House. "My starting point is not to worry about the politics. My starting point is to figure out what makes sense."
Harry Reid, the Democrats' leader in the Senate, was reported to be warning privately that he may not be able to deliver an assault weapons ban despite the party's majority. (© Daily Telegraph, London)