Updated version of an earlier story.
Police have provided more detail about the road-rage incident the night after Christmas that led to an armed robbery in an Atherton driveway, saying the victims were from out of town and were followed from Palo Alto.
The incident began in Palo Alto over a situation in which a driver in a Mercedes Benz reconsidered a decision to make a turn and instead merged back into traffic, according to Sgt. Alfredo Guarducci of the Atherton Police Department.
A man driving behind the Mercedes in a metallic blue Subaru appeared to became angry at the maneuver and started a chase that continued north on Middlefield Road into Menlo Park. The Subaru driver flashed his headlights at the Mercedes and yelled and screamed during the chase, police said.
In the Subaru, besides the driver, were at least two passengers, police said. Inside the Mercedes were two men and two women, all in their early 20s, police said. The driver was from Los Altos, as was one of the three passengers; the other two passengers were from San Jose and from out of state, police said.
Both vehicles stopped for a red light at Middlefield Road and Ravenswood Avenue. At that point, the driver of the Subaru got out and approached the Mercedes, yelling profanities as he came, police said.
One of the passengers in the Mercedes had been urging the driver to turn left on Ravenswood and head for the Menlo Park police station, but the driver -- unsettled by the physical approach of the Subaru's driver, police said -- instead chose to continue north on Middlefield.
A few minutes later, at about 8:35 p.m., the Mercedes's driver turned east on Oak Grove Avenue and turned into the first driveway encountered, at 230 Oak Grove Ave., police said. The Subaru followed and stopped close behind, and two men got out.
One of the men pointed a gun at the Mercedes and demanded the occupants' money, keys and cellphones. Sgt. Guarducci said he believed the occupants complied with the demand.
The men got back into the Subaru, left the scene and are still at large, police said. There were no injuries, Sgt. Guarducci said.
Police described the two men as Hispanic.