(Reuters) Iran's Revolutionary Guards denied on Tuesday Saudi accusations that Tehran has provided the Houthi movement in Yemen with ballistic capabilities, a day after a Houthi missile hit the Saudi capital, Riyadh.

"Everyone knows that all routes to send arms to Yemen are blocked," political deputy of the Islamic Revolutionary Guards Crops (IRGC), Brigadier General Yadollah Javani was quoted as saying by tasnim news agency.

"Yemenis have reached the capability to produce their own defensive weapons including missiles; an achievement that has been inconceivable to Saudis," he said.

The Saudi-led coalition fighting Yemen's Houthi movement said on Monday that ballistic missile attacks on Saudi Arabia were a serious escalation and threat to regional and international security.

Coalition spokesman Colonel Turki al-Malki told a news conference in Riyadh that Sunday's missile attacks on the Saudi capital were a clear violation of international law and accused the Houthis of smuggling weapons from Saudi Arabia's arch-rival Iran.