The family of an Italian al-Qaida hostage killed in a U.S. drone strike in Pakistan is appealing to U.S. President Barack Obama to provide details about the January 2015 operation.

A lawyer for Giovanni Lo Porto's family said Tuesday that they have yet to receive operation details despite Obama's orders for a full review of the counter-terrorism operation. Lo Porto was killed along with fellow aid worker and hostage Warren Weinstein and two al-Qaida operatives.

The Lo Porto family lawyer, Andrea Saccucci, said the letter requests the United States disclose details about the operation and provide compensation to the family. No amount was specified.

Lawyers also have forwarded requests to Italian prosecutors investigating Lo Porto's death to seek specific documents from U.S. authorities to complete the investigation.