A United Airlines flight that took off from San Diego Tuesday morning returned back to the airport and made an emergency landing after an external battery pack caught fire on board the plane. According to SDFD, the crew put the pack in a fire bag to prevent the fire from spreading to the rest of the plane. San Diego Fire Department confirmed that at least two passengers were taken to the hospital to be treated for smoke inhalation after United flight 2664 landed. The airline confirmed that several flight attendants were taken to the hospital as a precaution. MORE DETAILS: https://www.cbs8.com/article/news/local/sd-airport-plane-fire/509-0bc01c11-96e6-4e9f-bcf8-41497e1fd86a