II. individuals or groups, receiving or giving refuge to them, training, arming, financing, or providing any facilitation to them; 2. To cooperate and coordinate action among Contracting States, particularly neighbouring countries suffering from similar or common terrorist offences; 3. To develop and strengthen systems for the detection of the movement, importation, exportation, stockpilling and use of weapons, munitions and explosives and of other means of aggression, murder and destruction as well as procedures for monitoring their passage through customs and across borders in order to prevent their transfer from one Contracting State to another or to third-party States other than for lawful purposes; 4. To develop and strengthen systems concerned with surveillance procedures and the securing of borders and points of entry overland and by air in order to prevent illicit entry thereby; 5. To strengthen mechanisms for the security and protection of eminent persons, vital installations and means of public transportation, 6. To enhance the protection, security and safety of diplomatic and consular persons and missions and international and regional organizations accredited to Contracting States, in accordance with the relevant international agreements, which govern this subject; 7. To reinforce security-related information activities and to coordinate them with those of each State in accordance with its information policy, with a view to exposing the objectives of terrorist groups and organizations, thwarting their schemes and demonstrating the danger they pose to security and stability; 8. To establish, in each Contracting State, a database for the accumulation and analysis of information relating to terrorist elements, groups, movements and organizations and for the monitoring of developments with respect to the terrorist phenomenon and of successful experiences in counterterrorism; and to keep such information up to date and make it available to the competent authorities of Contracting States, within the limits established by the domestic laws and procedures of each State; Measures of suppression 1. To arrest the perpetrators of terrorist offences and to prosecute them in accordance with national law or extradite them in accordance with the provision's of this Convention or of any bilateral treaty between the requesting State and the requested State; 2. To provide effective protection for those working in the criminal justice field; 3. To provide effective protection for sources of information concerning terrorist offences and for witnesses thereto; 4. To extend necessary assistance to victims of terrorism; 5. To establish effective cooperation between the relevant agencies and the public in countering terrorism by, inter alia, establishing appropriate guarantees and incentives to encourage the reporting of terrorist acts, the provision of information to assist in their investigation, and cooperation in the arrest of perpetrators.