NET
6 There at Riblah the king of Babylon had Zedekiah’s sons put to death while Zedekiah was forced to watch. The king of Babylon also had all the nobles of Judah put to death.
Darby
6 And the king of Babylon slaughtered the sons of Zedekiah in Riblah before his eyes, and the king of Babylon slaughtered all the nobles of Judah;
KJV
6 Then the king of Babylon slew the sons of Zedekiah in Riblah before his eyes: also the king of Babylon slew all the nobles of Judah.