The fears of escalating regional tension are getting high due to involvement of regional countries in Yemen conflict. Agency reports quoting an adviser to the Saudi government say that Saudi Arabia has imposed a naval blockade on the Red Sea coast of northern Yemen to combat Yemen’s Shiite rebels along its border. It alleges that Yemeni rebels are being supplied arms and ammunitions through this route. Saudi move comes as Iran accused by the Arabs of backing the rebels. Iran’s foreign minister on the other hand warned neighbouring countries not to interfere in Yemen’s internal affairs. Saudi Arabia is conducting air strikes along its border in to Jebel al-Dukhan mountain area to drive out rebels from its territory. It said yesterday that it would keep up air strikes against Yemeni rebels until they pull back from its borders. The operation started after the rebels killed a Saudi border guard and occupied two small villages inside Saudi territory. Meanwhile The United Nations refugee agency (UNHCR) said in a statement that it is extremely concerned about the recent escalation of the conflict between Government forces and rebels in northern Yemen, and once again appealed for access to those displaced by the fighting. UNHCR said the number of people displaced or affected by fighting between rebels and government forces had climbed to 1 lakh 75 thousand. The Yemeni army has been pursuing an offensive against Houthi rebels in north since 11th August this year after the ceasefire broke between government and rebels.