CAIRO- Saudi Arabia offered a five-day humanitarian truce on Thursday to the Houthi militia it has hit with weeks of air strikes in neighboring Yemen, on condition that fighting across Yemen stops. International concern about Yemen's dire humanitarian situation has grown as fighting, air strikes and an arms embargo have led to civilian deaths, internal displacement, destruction of infrastructure and shortages of food, medicine and fuel.

"The pause will affect all of Yemen for a period of five days," Saudi foreign minister Adel al-Jubeir said. "The actual date will be announced shortly as well as the requirements.

"This is all based on the Houthis complying with the ceasefire." The offer of a truce comes days after the Houthis started shelling Saudi border towns, prompting renewed air strikes in Yemen, and as the militia advanced into a last central area of Aden, a city whose fate is seen as pivotal to Yemen's civil war.

At a news conference alongside Jubeir, U.S. Secretary of State John Kerry welcomed the proposal and said neither Riyadh nor Washington was talking about sending ground troops to Yemen. Saudi Arabia's military spokesman had said late on Wednesday that all options were open, including ground operations, to stop the mortar attacks on its border towns.

"We particularly welcome a new Saudi initiative to try to bring about a peaceful resolution through the announcement of their intent to establish a full, five-day, renewable ceasefire and humanitarian pause," Kerry said.