Qassemi made the remarks on Monday after a Saudi airstrike hit an MSF (Doctors Without Borders) hospital in Yemen’s Hajjah province and killed at least 25 people and injured some 20 others.

While condemning the latest Saudi attack, he stressed that the international community’s silence on Riyadh’s destruction of hospitals and schools is the reason behind  Saudis’ ceaseless atrocities in Yemen.

He stressed that “the terrorist-sponsoring and warmongering regime of Saud knows no boundaries and limits to killing children, women, the injured and civilians.”

The Houthi Ansarullah movement, which rules the capital Sana’a also condemned the attack, saying it was carried out in clear violation of a ceasefire agreement which has been holding across Yemen over the past four months.

The United States also denounced the attack on the MSF hospital, and called “on all parties to cease hostilities immediately.”

“We’re deeply concerned by a reported strike on a hospital in northern Yemen,” State Department spokesperson Elizabeth Trudeau said. “Strikes on humanitarian facilities, including hospitals, are particularly concerning.”

She added that the US is currently in close contact with the Saudis over the incident. “Continued military actions only prolong the suffering of the Yemeni people.”

Meanwhile, the UN has voiced it worries over a spike in child casualties over the last week in Yemen.

On Sunday, warplanes targeted a school and other locations in the northwestern province of Sa’ada, killing several civilians, many of them children.

“The children who were killed were between the ages of six and 14, and the majority were between six and eight,” said UNICEF’s Yemen representative Julien Harneis.

He also noted that the humanitarian situation in the country was severely deteriorating, adding that “you have got this real pressure cooker with a collapsing economy and a collapsing health system.”

“If the health system and education systems collapse then for years after the war ends, the country will be vulnerable to things like pandemics, and you will have lower education rates which are going to hamper the country for years, if not decades,” he added.

About 10,000 people have been killed since the Saudi aggression began in late March 2015. Yemenis say most of the victims in the Saudi airstrikes are civilians. The attacks by Riyadh are meant to reinstate the resigned president, Abd Rabbuh Mansur Hadi.

Continued consultations among the influential actors can prepare the ground for the essential requirements for an exit from the crisis in Syria, Iran’s Deputy Foreign Minister for Arab and African Affairs Hossein Jaberi Ansari told reporters on the sidelines of a meeting with Russian president’s special envoy to the Middle East, Mikhail Bogdanov, held in Tehran on Monday.

To that end, he added, Iran and Turkey have agreed to exchange diplomatic delegations for talks on Syria.

Jaberi Ansari said he will take a trip to Turkey for “more detailed negotiations about the regional issues,” noting that Turkish Deputy Foreign Minister Umit Yalcin will be also invited to visit Iran soon.

Hailing Turkey as a major and influential country in the region, he added that Tehran and Ankara have always had intensive consultations during the crisis in Syria, saying two neighbours have reached a general consensus on the fundamentals of Syria crisis settlement.

As regards the main principles that all parties need to agree on, the Iranian diplomat highlighted the respect for Syria’s territorial integrity and national sovereignty, formation of a national and inclusive administration and the Syrian nation’s right to decide its own fate.

Syria has been gripped by civil war since March 2011 with various terrorist groups, including Daesh (also known as ISIS or ISIL), currently controlling parts of it.

According to a recent report by the Syrian Centre for Policy Research, the conflict has claimed the lives of over 470,000 people, injured 1.9 million others, and displaced nearly half of the country’s pre-war population of about 23 million within or beyond its borders.

Iranian Foreign Minister Mohammad Javad Zarif held a meeting with Russian Deputy Foreign Minister Mikhail Bogdanov in Tehran, Press TV reported.

During the meeting, Zarif and Bogdanov stressed the importance of closer consultation between Iran and Russia on ways to solve the crisis in Syria.

Bogdanov, who also serves as Russian President Vladimir Putin’s special envoy to the Middle East, is in Tehran to hold talks with senior Iranian officials. Earlier on Monday, he met with Iranian Deputy Foreign Minister for Arab and African Affairs Hossein Jaberi Ansari.

Iran and Russia are Syria’s main allies and have been assisting the government in Damascus in its fight against foreign-backed terrorist groups, including Takfiri ISIS terrorists.

Since September 30, 2015, Russia has been conducting airstrikes against Daesh and other terrorist groups in Syria at the Syrian government’s request.

Iran has also been providing advisory military assistance to the Syrian government.

Syria has been gripped by a foreign-backed militancy since March 2011. UN special envoy for Syria Staffan de Mistura estimates that over 400,000 people have been killed in the conflict.