Defence Secretary Lloyd Austin has formally approved an extension of the National Guard deployment at the U.S. Capitol for about two more months as possible threats of violence remain, the Pentagon said Tuesday. According to a statement issued by the department, close to 2,300 Guard troops will continue to provide security in Washington until May 23, at the request of the Capitol Police. Officials have been scrambling in recent days to determine if and how to fill the request, as the original March 12 deadline for them to leave Washington loomed. There are currently about 5,100 Guard troops in Washington, and they were scheduled to leave this weekend. It was unclear if any of those forces will have to stay an extra day or two while any new troops arrive and get trained and settled in. The Pentagon said defence officials will work with the Capitol Police to incrementally reduce the number of Guard needed in the city as time goes on.