Saudi Arabia is moving heavy military equipment including artillery to areas near its border with Yemen.
"The armor and artillery being moved by Saudi Arabia could be used for offensive or defensive purposes," two US government sources said. One of them said the build-up appeared to be defensive.
"One source said the Saudis could be preparing air strikes to defend President Abd-Rabbu Mansour Hadi if the Houthis attack his refuge in the southern seaport of Aden," TASS reports.
Another US official said Washington had acquired intelligence about the Saudi build-up. But there were no comments on the precise location near the border or the exact size of the force deployed.
