Authorities are continuing their search for an unidentified shooter in the death of Charlie Kirk.

Federal, state and local authorities said they are working what they called "multiple active crime scenes."

RELATED: Charlie Kirk shooting: Person of interest photos released by FBI

Kirk, the conservative activist and founder of Turning Point USA, was shot and killed at Utah Valley University during the first stop of his American Comeback Tour on Wednesday afternoon.

Two people were detained Wednesday, but neither was determined to be connected to the shooting and both were released, Utah public safety officials said. Authorities did not immediately identify a motive.

Here's the latest:

FBI offers $100K reward for info on Kirk shooting suspect

1:08 p.m. ET: The FBI is offering a rew

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