Thailand's acting Prime Minister Phumtham Wechayachai warned Friday that cross-border clashes with Cambodia that have uprooted more than 130,000 people "could develop into war", as the countries traded deadly strikes for a second day. A long-running border dispute erupted into intense fighting with jets, artillery, tanks and ground troops on Thursday, and the UN Security Council is set to hold an emergency meeting on the crisis later Friday. On Friday evening, a Thai military border commander declared martial law in eight districts on the frontier with Cambodia, citing "Cambodia's use of force to enter Thai territory".