According to Colville, the strikes took place in Sanaa, Saada, Hudaydah and Taiz provinces.
"We are deeply concerned at the recent surge in civilian casualties in Yemen as a result of intensified airstrikes by the Saudi-led coalition, following the killing of former President Ali Abdullah Saleh in Sana’a on 4 December … Our Office in Yemen verified that 136 civilians and non-combatants were killed and some 87 injured as a result of airstrikes in Sana’a, Sa’ada, Al Hudaydah and Taizz governorates in the period from 6 to 16 December," Colville said as quoted on the UN OHCHR website.
The Saudi-led coalition has been participating in the Yemeni military conflict since March 2015 upon the request of President Abd Rabbuh Mansur Hadi, fighting against the Houthi rebels, who previously allied with forces loyal to former President Ali Abdullah Saleh.
Since late November the conflict has further escalated after Saleh had cut ties with the Houthis forces and urged to start a "new page" with the Saudi-lead coalition forces. The move resulted in intensified clashes between the rebels and Saleh's forces, resulting in the Houthis' killing of the former Yemeni president.
Amid the recent escalation of the years-long conflict, Yemeni authorities have urged humanitarian organizations to relocate their personnel to the temporary capital of Aden amid the agencies' recent decision to evacuate personnel from Sanaa that is currently controlled by the Houthi movement.