If Mulsim women are captured and violated by a Muslim army then it's valid because they are maal-e-ghanimah.
At least that was the 'fatawa' used during 1971.
The real ruling is Muslim women are off limits and violation of Muslim women by a Muslim army is sinful and punishable under the Shariah.
I pray and hope that Pakistanis bring these dogs to justice and don't sweep it under the rugs. And I don't use the word 'dog' because they are Pakistani military or law enforcement or from any other country. The word 'dog' applies to anybody who violates Muslim women.