Fleetwood Mac guitarist and singer Lindsey Buckingham was attacked on Wednesday, April 1, in Los Angeles, Us Weekly can confirm. Buckingham, 76, was entering a building in Santa Monica for an appointment on Wednesday when a woman threw an "unknown substance" at him and ran off, according to NBC4 Investigates, which was first to report the news. Police described the woman as a "stalking suspect," whom Buckingham knows from past incidents, per the outlet. The woman has since been identified, but no arrests were reported as of Wednesday morning.