Projectiles fired by Yemen's Houthi rebels have killed seven civilians in the southern Saudi city of Najran, Saudi state television has reported.

The Houthis targeted a crowd on Tuesday at an industrial area of Najran, close to the Yemeni border, Ekhbariyah television channel said.

Four Saudi citizens and three expatriate workers were among the dead, it said.

An Arab military coalition, led by Saudi Arabia, has been conducting air strikes on Houthi positions in Yemen since March 2015 in support of the government of President Abd-Rabbu Mansour Hadi.

The coalition stepped up the raids this month after UN-mediated peace talks between the rebels and the internationally-backed government were suspended.

PHOTO CAPTION

Houthi fighters ride on the back of a patrol truck in a rural area near Sanaa, Yemen July 21, 2016 [REUTERS]

Al-Jazeera