MENLO PARK — Two 6-year-old twin brothers were seriously injured Thursday after a 90-year-old male driver in a sports utility vehicle jumped a curb and pinned them against the wall of a Walgreens in Menlo Park.

Police responded to a call about the accident in the 600 block of Santa Cruz Avenue around 2:15 p.m., according to Menlo Park Police Cmd. Dave Bertini.

The driver “mistakenly pressed on his accelerator instead of his brake” as he was pulling his silver BMW sports utility vehicle out of a parking spot, Bertini said.

Bystanders quickly tried to help, with one person opening a door to shift the vehicle in reverse while others grabbed and pulled the SUV away from the injured boys, who were pinned to the wall and “screaming,” Bertini said.

The impact of the collision shattered some of the exterior wall tiles of the drugstore.

A preliminary investigation does not indicate that the man, a Woodside resident, was under the influence of drugs or alcohol, Bertini said. He declined to identify the driver, who was not charged with any crime. Investigators will try to determine whether there was a “mechanical issue,” he said.

After the accident, the white-haired, bespectacled driver sat in the seat of a walker, his head in his hands, as he waited for a family friend to pick him up.

The 6-year-olds were taken to Stanford Hospital. One was listed as critical with possible life-threatening injuries and was in surgery Thursday afternoon; the other had non-life threatening injuries.

A nanny who was walking with the boys also suffered minor injuries from the crash, Bertini said. An accompanying 11-year-old brother escaped harm.

Email Bonnie Eslinger at beslinger@dailynewsgroup.com.