June 12, 2021 6:25 pm Mystery “Boom” Caused by Aircraft Training The mysterious boom heard across San Diego County this past Tuesday was possibly caused by aircraft training, MCAS Miramar said. NBC 7’s Omari Fleming reports. US & World Videos 2:53 Beach closure from Surfrider Way to Tyson Street in effect due to Oceanside Pier fire 2:41 San Diego lifeguards describe fighting Oceanside Pier fire 2:58 NASA researchers aim to enhance safety, flight operations in wildland firefighting 2:47 San Diego welding students recreate replica of historic Black Family Statues 4:29 Escondido woman warned husband may be a killer: Dateline