Just as an armed man approached the driver of a party bus menacingly early Sunday morning in the 1900 block of East Foothill Boulevard, a witness happened upon the scene and the gunman fled, Pasadena police Sgt. Robert Tucker said.
The suspect, described as Latino in his twenties, said nothing and did not fire his weapon, Tucker said.
The party bus was empty of passengers. The driver was not injured.
Tucker said the suspect was not apprehended.