U.S. officials have now confirmed that Sascha and Alexander Pinczowski, siblings who were living in New York, were killed in the terror attack on the Brussels airport.

The two Dutch citizens had been unaccounted for since Tuesday, when 31 people were killed in explosions at the airport and a nearby metro station. 

The family had said in recent days that one of the siblings was on the phone with a relative, having just arrived at the airport, when the bomb went off.

According to reports, Sascha Pinczowski's Facebook profile says she's from Greece, but was living in New York. Alexander's LinkedIn page listed Manhattan as his home.

A couple from Kentucky, Justin and Stephanie Shults, remain unaccounted for since Tuesday. They had moved to Belgium in 2014.

O'Reilly: 'Ultra-Liberal' Policies Have Made Europe 'Easiest Target in the World'

Palkot Reports From Inside Brussels' 'Hotbed of Islamic Radicalism'

UK Man Asks Muslim Woman to 'Explain Brussels,' Gets Arrested for Tweet