ESA’s space debris team provided their final estimate for reentry, forecasting a window of about four hours between 23:00 UTC on 1 April to 03:00 UTC on 2 April.
Tiangong-1 was launched 30 September 2011. The space station hosted one uncrewed and 2 crewed missions during it’s life.
A controlled descent was first planned at the end of the station’s life, however, the station ceased functioning in March 2016 and can no longer be commanded to fire it’s engines so is expected to make an uncontrolled re-entry.