“With a broken heart and a soul that just can’t process all this right now, I have to announce my niece was one of the fatalities,” her aunt, Sylvia Pritchett, wrote in a Facebook post. “Please keep all the families in your thoughts, and hug your children tightly.”

Sabika Sheikh

Sabika Sheikh, 17, was supposed to return home to Pakistan in a matter of weeks. After months at Santa Fe High School as part of an exchange program sponsored by the State Department, Sabika had asked her mother to cook her favorite meal when she was to get back on June 9. She had asked her younger brother, Ali, to straighten up her room for her arrival. She had spoken to her younger sister on the telephone just hours before the shooting started.

“She was thinking big, at such a young age,” her father, Abdul Aziz Sheikh, said from his home in Karachi. “Sabika was a very talented and obedient child.”

He said he learned of his daughter’s death after seeing news reports and trying — again and again — to dial and text his daughter’s telephone. “There was nothing I heard back from her,” he said.

Mr. Sheikh eventually heard from exchange program leaders that his daughter had died in the shooting. He called on American officials to enact stronger gun regulations, and said he hoped no other family would have to experience such pain.

“I knew the pain of losing a child,” he said, “and pray to God, no parent would go through this situation.”

On the Pakistani Embassy in Washington’s Facebook page, Pakistan’s ambassador to the United States expressed condolences to families of the victims.

Image Sabika Sheikh.

“Our thoughts and prayers are with Sabika’s family and friends,” the ambassador, Aizaz Ahmad Chaudhry, said.

American officials said Sabika had been part of the Kennedy-Lugar Youth Exchange and Study (YES) program. A State Department official said the department extended its deepest condolences to Sabika’s family and friends, and that David Hale, the ambassador to Pakistan, was reaching out to her family.

“As an exchange student, Sabika was a youth ambassador, a bridge between our peoples and cultures,” Mr. Hale said on Facebook on Saturday. “All of us at the U.S. Mission in Pakistan are devastated by and mourn her loss. We will honor her memory.”

Christopher Stone

At 17 years old, Christopher Stone was the baby of the family, the youngest of three siblings. But he still played the role of protector to his sisters, Angelica and Mercedez, as if he were the oldest, said his father, who is also named Christopher.