Tanks, border guards and artillery moved to area adjacent to Houthi stronghold after mortars kill three Saudi troops.
Former Yemeni President Ali Abdullah Saleh has sent messages to Arab Gulf states, asking for a safe exit for himself and his family, sources told Al Jazeera.
Saleh, who was forced to step down in 2012 after a wave of protests against his rule, is said to be backing Houthi rebels who have seized the capital Sanaa and are battling forces loyal to embattled President Abd-Rabbu Mansour Hadi, who fled to Saudi Arabia.
The message for safe passage was communicated by leaders of the General Popular Congress, including former Foreign Minister Abu Bakr al-Qirbi, sources told Al Jazeera. Saleh has been leader of the GPC.
Sources said the request was rejected by Saudi Arabia, which is a member of the six-nation Gulf Cooperation Council and is leading a coalition that has bombed Houthi positions since March 26.
While not mentioning the request directly, Brigadier General Ahmed al-Asiri, spokesman for the Saudi military told Al Jazeera that Saleh would have no role in Yemen’s future.
“Ali Abdullah Saleh is not part of the plan…nobody thinking logically can think he can be a part of the solution,” Asiri said.
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“Of course this contradicts to what he has said earlier when he sent his son, Ahmed Ali Abdullah Saleh just before the beginning of the [Saudi-led] airstrikes with the same offer, saying that he would abandon the Houthis.”
The rebels are in control of the capital Sanaa, which they overran in September. In February, they put Hadi under house arrest, demanding he carry out political reforms.
Hadi has continued to run Yemen affairs from Riyadh, and on Sunday appointed his former prime minister as vice president, just days after he carried out a shakeup in the top echelons of the country’s military.
On Tuesday, the UN Security Council passed a resolution imposing an arms embargo on the rebels and calling on them to withdraw from the areas they control. The resolution also blacklisted Saleh son’s, Ahmed, who faces a travel ban.
The rebels condemned the resolution, saying the decision supported “aggression”.