MILWAUKEE, May 4 (UPI) — The U.S. Homeland Security Department will conduct a multi-agency exercise Tuesday to test emergency response capabilities to a waterborne terrorist attack.

KATHMANDU, Nepal, May 4 (UPI) — The head of the United Nations called on Nepalese leaders Monday to maintain stability following the resignation of the country’s prime minister.

N’DJAMENA, Chad, May 4 (UPI) — The deployment of troops along both sides of the Sudan-Chad border has prompted calls from the United Nations for leaders in the countries to avoid conflict.

BRUSSELS, May 4 (UPI) — The Sri Lankan army’s conflict with rebels and the worsening humanitarian crisis in the north of the country have topped the monthly CrisisWatch report.

ADDIS ABABA, Ethiopia, May 4 (UPI) — The African Union and Interpol are working to strengthen cooperation in a move to better counter threats from transnational criminal groups and terrorists.