Brown University shooter still at large three days after mass shooting.

The Brown University Gunman Is Still Out There—Here's Why They Can't Find Him #As the 48-hour mark passed on Monday, the authorities renewed their efforts to find the gunman. F.B.I. ballistics experts worked to recreate the scene. The police knocked on doors asking for security camera footage, searched back alleys and kicked through fields of snow. The FBI has offered a $50,000 dollar reward for information leading to the gunman's arrest and conviction.