Powerful thunderstorms forced ground stops that delayed dozens of flights at Dallas airports Thursday, while stormy weather downed trees and knocked out power to thousands of customers in Oregon and Washington. Kati Weis reports from Houston. There are new details about what may have caused a passenger jet that was headed from Azerbaijan to Russia to crash in Kazakhstan. A U.S. official told CBS News that there are preliminary indications that a Russian anti-aircraft system may have hit the plane, which was carrying 67 people. Several dozen people died in the crash, but dozens also survived. Chris Livesay has the latest. At a FedEx shipping hub in Anchorage, Alaska, employees can sort up to 80,000 packages a day during the holidays. And as they're dealing with a last wave of Christmas gifts getting ready to ship out this week, they're also dealing with a new wave of gifts that are being returned. Kris Van Cleave takes an inside look at the process. Tom Homan, President-elect Donald Trump's incoming "border czar," told the Washington Post in an interview this week that Trump's new administration plans to revive the controversial practice of detaining migrant families and giving undocumented parents the choice of leaving their U.S.-born children behind or having the children deported with them. Lilia Luciano reports. Research suggests the human brain is not wired to multitask on complicated tasks, and experts say it can cause more damage to our wellbeing than we realize. Dr. Jon LaPook explains. The Toy Nest in Falls Church, Virginia, is a toy library that works on a membership program. The moms who buy-in say it allows them to cut down on toy waste, while saving money and adding variety. Natalie Brand explains how the novel idea works.

In Delray Beach, Florida, authorities investigated a crash between a fire truck and a commuter train in the center of town on Saturday which left more than a dozen people hurt. Cristian Benavides reports. A series of tornadoes were reported in the Houston area Saturday, as severe weather was pounding Texas with high winds and large hail. Kati Weis has more. Thousands of flights were delayed across the U.S. Saturday amid what AAA predicts will be a record holiday travel season. Kerry Corrado reports on the rush home. With nearly the entire Gaza population displaced and many living in flimsy tents, this winter is bringing the biting cold and hypothermia. Holly Williams reports. Russian President Vladimir Putin on Saturday issued an apology for the Azerbaijan Airlines passenger jet crash in Kazakhstan that occurred earlier this week but stopped short of claiming responsibility for it. Actress Olivia Hussey, who shot to fame for her portrayal of Juliet in Franco Zeffirelli's controversial 1968 rendition of "Romeo and Juliet," has died at the age of 73. A baby pygmy hippo is the gift the Metro Richmond Zoo in Virginia received for Christmas this year. Weighing in at just 15 pounds, the new hippo's name will be decided in an online poll that closes on Tuesday. Horse-powered therapy at the Legacy Ranch outside of Chicago has helped people with mental, occupational and physical challenges on their road to recovery. Charlie De Mar reports on how the ranch is literally and physically getting folks back on the horse.