Santan, Ariz. -- Neighbors of Arizona's San Tan Mountain Regional Park complained that they were not warned before authorities used the park to detonate a grenade.
Alden Rosbrook said the explosion late in the evening May 22 knocked pictures off the wall of his home while he was watching TV with his wife, the East Valley Tribune of Mesa, Ariz., reported Thursday.
"I thought a bomb had been thrown through our Arcadia door," Rosbrook said. "That was my first thought."
Rosbrook said he soon discovered that the explosion was the Maricopa County Sheriff's Office disposing of a grenade.