The unarmed Rivet Joint surveillance aircraft was conducting a "routine international flight" during the incidents, the Ministry of Defence says.
Paying tribute, their father says "no words can truly describe the pain of losing three daughters".
The former health secretary quit last week, saying he'd lost confidence in Prime Minister Sir Keir Starmer's leadership.
Michelle Sadio was caught in the crossfire as shots were fired at mourners outside a wake.
A minister confirms talks have taken place but says there will be no mandatory cap on essential food prices.