The families of a 20-year-old midshipman at the U.S. Naval Academy, an Associated Press employee and a technology executive were mourning Wednesday after the Amtrak derailment in Philadelphia Tuesday night that left at least seven people dead.

An administrator at the City University of New York was also killed in the wreck, and Wells Fargo said one of its employees was confirmed dead. The relatives of a missing Baltimore-area man whose cellphone was found on the train tracks were waiting anxiously for information.

Justin Zemser, of New York City, was on his way home from his second year at the U.S. Naval Academy in Annapolis, Md. His mother, Susan, said she was waiting for him to arrive Tuesday night when she saw news of the crash on television. She kept calling hospitals in vain for information, but got a phone call in the morning confirming his death.

“He was a loving son, nephew and cousin, who was very community-minded,” she told reporters in front of the family’s apartment building in Rockaway Beach, Queens. “This tragedy has shocked us all in the worst way.”

“He was absolutely wonderful,” she said, teary. “Everybody looked up to my son.”