Pipe bomb experts are heading to Capitol Hill on Tuesday to testify on law enforcement’s response to explosive devices left outside the Democratic National Committee and the Republican National Committee on Jan. 6, 2021, with several expected to note that investigations “take time” and are “not like TV shows.”

The testimonies on Tuesday are part of a larger investigation by House Republicans into the riots at the Capitol on Jan. 6, particularly as the people responsible for placing the pipe bombs outside the national committees have not been caught after three years and the FBI offering a $500,000 reward.