SAN LEANDRO -- Two teenagers were arrested, and police were still searching for others involved in three confrontations they said involved a group of teens and young adults who beat up their victims and took from them Nike shoes, cell phones and other electronics.

The two teens were arrested shortly after police arrived to the 2000 block of E. 14th Street around 4:40 p.m. on Monday after a sergeant saw a disturbance, San Leandro police Lt. Richard DeCosta said. Witnesses told police that a man, woman and 2-year-old child were driving into a parking lot when a large group of teens blocked the entrance and told the people in the car to go around.

The two adults got out of the car to confront the teens, and one of the teens responded by throwing a metal chair that nearly hit the woman, DeCosta said. During the confrontation, another teen ransacked the passenger compartment, and another teen got into the driver's seat, put it into gear and began driving it out of the parking lot with the baby in tow, DeCosta said. That teen stopped the car just before police showed up, DeCosta said.

In the aftermath, one of the victims discovered that her computer tablet and iPhone were stolen from the car, DeCosta said. The two teens arrested over that incident are expected to be charged with assault with a deadly weapon, carjacking, kidnapping and child endangerment. Police did not say immediately whether the stolen items were recovered, or whether the teens might be charged in connection to their theft.

The arrests occurred about 40 minutes after police said three older teenagers combined to swipe a shopping bag with Nike shoes from two middle-school students who were walking in the 2100 block of E. 14th Street. One of the teens grabbed the boy carrying the bag and tried to rip away the bag, and when the student fought back, another of the teens pulled out a black handgun and pistol-whipped him into unconsciousness, DeCosta said. He received stitches at a hospital but was otherwise OK, DeCosta said.

The other middle-school student ran away, but at least one of the teens caught up to him, punched him, threw him to the ground, then forcibly removed the Nike's from his feet. That boy also had his iPhone stolen, DeCosta said.

The Monday attacks came two days a large group of people estimated to be between 10 and 20 years old confronted two kids at the BayFair BART station. During that attack, which happened around 10 p.m. on May 31, both kids tried to run away, DeCosta said. But part of the group chased him across the parking lot and across Fairmont Drive before catching him, beating and kicking him, and removing his Nike shoes and iPhone, DeCosta said. The second victim was able to escape the group and contacted police, DeCosta said.

Police still have not identified the suspects in that beating.

Anyone with information is urged to call the San Leandro Police Department at 510-577-3230. Anonymous tips can be left at 510-577-3278.

Contact Rick Hurd at 925-945-4789 and follow him at Twitter.com/3rderh