From a spokesperson for Representative Houlahan:

Representative Houlahan's district office in West Chester, PA was the target of a bomb threat earlier today. Thankfully, the staff there as well as at the office in Washington, D.C. are safe. We are grateful for our local law enforcement agencies who reacted quickly and are investigating.

As Rep. Houlahan has said many times over, there is no place for threats and political violence in our nation or our political discourse.