The US has carried out "unlawful killings" in Pakistan through drone attacks, some of which could even amount to war crimes, a human rights group said today.

In its report, the Amnesty International (AI) also expressed concern that "some officials and institutions" in Pakistan and in other countries including Australia, Germany and the UK may be assisting the US to carry out drone strikes that constitute human rights violations.

The report, "Will I be next? US drone strikes in Pakistan", has said a number of civilians were killed in US drone strikes in Pakistan.

The report said that according to NGO and Pakistan government sources, the US has launched some 330 to 374 drone strikes in Pakistan between 2004 and September 2013.