Two siblings from New York City who were visiting Brussels during Tuesday's terror attacks are missing, their family said.
A Dutch newspaper reports that Sascha and Alexander Pinczowski had traveled to Brussels Airport on Tuesday and called relatives to check in around the time the two blasts went off.
The family of the siblings met at a hospital where a list of surviving victims was released, but their names were not on the list.
Relatives told the newspaper that they heard a blast and shattering glass before the line went dead. They said they were unable to reach the siblings since then.
In a statement, family members asked for prayers and privacy "during this time of grieving as we await final closure."
A friend in the Netherlands posted to Facebook after the attacks that she was still looking for the siblings.
"We are still looking for Alexander Pinczowski and his sister Sascha," Karen Cage said in the post. "They are missing in the Brussels airport attack since this morning."
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The Dutch newspaper reports that the siblings both live in New York and that their father is in the Netherlands.
The U.S. State Department said Wednesday that it was aware of 12 Americans hurt in the terrorist attacks that rocked a subway station and the airport Tuesday morning. At least 31 people were killed in the attacks and at least 212 others were hurt.
"At this time, we are not aware of any U.S. citizen deaths," said Mark Toner, the deputy spokesman for the State Department. "We must emphasize that a number of U.S. citizens remain unaccounted for and the Kingdom of Belgium has not yet released nationality information for reported fatalities."
It's not clear if the Pinczowski siblings are among the injured or unaccounted for Americans.
NBC News reported Tuesday, citing military officials, that a U.S. service member and four members of his family were among the Americans injured. Their identities have not been released, but one official said their injuries are not believed to be life-threatening.
According to The Associated Press, an Air Force officer, his wife and four children hurt at the airport. It's not clear if the Air Force officer is the same service member mentioned in NBC News' report.
Three Mormon missionaries from Utah were also hurt. The Church of Jesus Christ of Latter-day Saints issued a statement Tuesday identifying the missionaries as 66-year-old Richard Norby, 20-year-old Joseph Empey and 19-year-old Mason Wells.
Family members of an American couple living in Belgium told NBC News the two are missing. Justin and Stephanie Shults had just dropped off her mother at the airport when two blasts went off.
"Her mom is fine but no one has been able to contact Justin or Stephanie," Justin Shults' brother, Levi Sutton, told NBC News. He added that the State Department told him Tuesday afternoon that the pair were not on any casualty list.
Justin, 30, is originally from Gatlinburg, Tennessee, while 29-year-old Stephanie is from Lexington, Kentucky, but moved to the Belgian capital in 2014, Sutton said. Both work as accountants.
ISIS has claimed responsibility for Tuesday morning's attacks. The suspected suicide bombers were named early Wednesday as Khalid El Bakraoui, 27, and his 30-year-old brother Ibrahim.
