The human rights group Amnesty International says NATO has not paid compensation or properly investigated civilian deaths caused by its airstrikes in Libya last year.

Amnesty says NATO took significant efforts to prevent civilian casualties. But the human rights group says that does not relieve NATO from the responsibility to investigate.

The group says many of the casualties came when NATO bombed targets which Amnesty says had no military purpose.

NATO says it deeply regrets any harm its airstrikes caused to innocents. But it says it no longer has a mandate to carry out any activities in Libya.

NATO's seven month long air campaign in Libya helped lead to the ouster of the late dictator Moammar Gadhafi.