India, July 26 -- The UN Secretary-General has urged "utmost restraint" amid intensifying border clashes between Thailand and Cambodia as the Security Council met behind closed doors on Friday to address the most serious escalation between the two Southeast Asian neighbours in more than a decade.

The clashes, which began on 24 July, reportedly involved exchanges of gunfire, artillery shelling and rocket fire, with Thailand having conducted airstrikes inside Cambodian territory.

UN humanitarian officials confirmed civilian casualties, including children.

More than 131,000 people in Thailand and over 4,000 in Cambodia have been displaced, according to relief partners. Temporary shelters, including schools and temples, are overcrowded, an...