US Ambassador Marcia Bernicat has said the United States will cooperate in the investigation of the killings that took place recently in Bangladesh.She made the statement while talking to the journalists after finishing the meeting with Home Minister Asaduzzaman Khan Kamal at secretariat on Wednesday.US ambassador told journalists that she met with the Home Minister to talk about the recent killings.In the mean time she informed minister that United States condemned all the killings.The US ambassador said it is not possible for the Government of Bangladesh and police to fight against such killings, so joint cooperation’s are needed to investigate all the killings.