A team from the Institute of Archaeology at Goethe University made the last-minute discovery after the excavation had already wrapped.
Two children are the first ever to be released by ISIS, according to Assyrian group.
After years of slow but steady decline, Christians are being driven from the Middle East by ISIS.
Militants pillage 3,000-year-old pre-Islamic site a week after smashing artefacts in Mosul.
The Nineveh Plains Protection Unit is preparing to reclaim territory captured by the terror group last summer.