LAPD break up huge underground party held near 110 and 5 freeways Published Police break up huge party under freeways in Cypress Park LOS ANGELES - The Los Angeles Police Department issued a citywide tactical alert Saturday night after a Cypress Park party swelled to 1,500 to 2,000 people. Officers were called in to disperse the crowd. The party was held on Riverside Drive near the transition from the northbound Arroyo Seco Parkway (110) and the northbound Golden State (5) Freeway near the Los Angeles River. The first call came in to the LAPD about 7 p.m., according to Officer G. Todd of the Operations Center.