South Gate police received a call about a Marine aircraft that made a precautionary landing in the riverbed around 1 p.m.
Police Friday were investigating the shooting of a man in an Orange County riverbed.
A decapitated body was discovered Thursday near a riverbed in Irwindale.
A 57-year-old man was found dead in a Santa Ana riverbed, according to officials.
Santa Ana police Wednesday released a composite sketch of a man they said sexually assaulted a 19-year-old woman Saturday in a Santa Ana River bed.