According to Alalam reports on Sunday, artillery shells fired by Saudi forces hit areas in the district of Harad in the northwestern province of Hajja.

Saudi forces also targeted the northwestern Yemeni province of Sa'ada. Reports said that at least four rockets fired by Saudi forces landed in the al-Hassamah area in the province.

The Saudi attacks on Sunday came as a truce which went into effect on May 12 entered its last day.

The ceasefire took effect nearly seven weeks after Saudi Arabia started its military aggression against Yemen in a bid to undermine the Houthi Ansarullah movement, which currently controls the capital and major provinces, and to restore power to the fugitive former president, Abd Rabbuh Mansur Hadi, who is a staunch ally of Riyadh.

Saudi warplanes hit targets in Hajjah and Abyan provinces as well, while bombarding the neighborhoods of Khormaksar, al-Tawahi and Mualla in the southern province of Aden.

UN Humanitarian Coordinator for Yemen Johannes Van der Klaauw said on Friday that over 1,600 people have been killed and more than 6,200 injured in Yemen since conflict started there in late March.

He added that some 450,000 people have been displaced as a result of the continuing violence.