The Saudi warplanes resumed their air raids on Yemen on Wednesday, hitting the central prison in Taiz city, while reports from Sana'a and Saada said heavy bombings by the Saudi-led coalition continued since this morning.

"We see the security of the region and as the security of the Islamic Republic of Iran and will show strong reaction to any move that complicates the situation no matter its done by Saudi Arabia or any other actor," Amir Abdollahian told the state-run TV.

"The Islamic Republic of Iran believes that all efforts, particularly those by the United Nations, should be guided, in conformity with the Charter of the United Nations and fundamental principles of international humanitarian law, by the following objectives: 1. Ceasefire and an immediate end to all foreign military attacks; 2. Unimpeded urgent humanitarian and medical assistance to the people of Yemen; 3. Resumption of Yemeni-lead and Yemeni-owned national dialogue, with the participation of the representatives of all political parties and social groups; 4. Establishment of an inclusive national unity government," Zarif said in his letter.

Despite Riyadh's claims that it was bombing the positions of the Ansarullah fighters, Saudi warplanes were flattening residential areas and civilian infrastructures.