Terrorism is a common threat to most countries in the twenty-first century. Terrorism, like other crimes that transcend borders, creates a number of complications for law enforcement and is a potential challenge for police forces throughout the world. International cooperative ventures in policing have confronted a number of obstacles. Although international police cooperation is not a new area of study, as transnational crime and the concomitant increase in terrorist activities, the need for police services from different countries to cooperate effectively has become a paramount concern. This paper examines various barriers to international police cooperation engaged in fighting.