The airstrikes' campaign by Sunni Arab states, which began last week, is meant to halt the advance by the Shiite rebels known as the Houthis who have overrun the country and forced Yemen's president to flee abroad.
Overnight and into early hours today, the coalition bombed the Iran-backed rebels around the capital, Sanaa, according to Yemeni military officials. The strikes targeted Houthi positions and camps, as well as weapons depots controlled by the rebels, the officials said.
The aid contained 19 tons of medicines and medical equipment and two tons of food provided by the Iranian Red Crescent, IRNA said.
The agency reported that the aid was delivered by air early Tuesday but did not say where the cargo landed. The coalition has bombed a number of rebel-held airports and has announced it is in full control of Yemen's airspace.
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The conflict in Yemen marks a major escalation in the regional struggle for influence between Saudi Arabia and Iran, which also back rival sides in Syria's civil war. Arab leaders unveiled plans at a conference Sunday in Egypt to form a joint military intervention force for Yemen, which could raise tensions further.
"Claims about the dispatch of weapons from the Islamic Republic of Iran to Yemen are completely fabricated and sheer lies," said the Foreign Ministry's spokeswoman, Marzieh Afkham.
Afkham criticized Saudi-led airstrikes, saying they have caused a high number of casualties and extensive damage.
The Saudi-led coalition on yesterday announced it has effectively imposed a naval blockade, days after taking control of the country airspace, to prevent weapons or fighters from getting in or out of Yemen. Also the coalition repelled a push by the Houthis and their allies, loyal to Yemen's ousted President Ali Abdullah Saleh, toward Aden.