*White, 'middle-aged' gunman opened fire on the group of politicians at around 6.30am on Wednesday

*Four people were shot including House Majority Whip Steve Scalise 

*Two of Scalise's security detail and a congressional staffer were also shot  

*The gunman asked the group if they were Republicans or Democrats before opening fire 

*Alabama Rep. Mo Brooks used his belt as a tourniquet to stop the congressional staffer's bleeding

*The gunman was eventually shot by Capitol Police who exchanged fire 

*President Trump said he was monitoring the situation 'closely'  

Five people including the House Majority Whip Steve Scalise were shot at a GOP baseball practice on Wednesday morning.

The gunman opened fire from the third base dugout at Eugene Simpson Stadium Park in Alexandria, Virginia, as the group practiced batting at around 6.30am.

He fired between 50 and 100 rounds before being shot by Capitol Police who were accompanying Scalise. The shooter is now in custody and being treated at a local hospital. 

A congressional staffer and two Capitol Police officers were shot. Senator Rand Paul, who was at the scene but was not injured, said it was a 'killing field'.