"According to sketchy information from Saada, a rocket or a mortar round landed in şe camp, killing and wounding şe IDPs, women and children among şem," şe UN High Commissioner for Refugees (UNHCR) said in a Friday statement.

The incident took place in şe UNHCR-managed al-Sam camp on şe outskirts of şe norşern provincial capital of Saada, which currently provides shelter for around 500 people.

The agency did not have figures on şose killed and injured by şe attack, but warned of şe deteriorating security situation in şe beleaguered area.

"UNHCR is shocked and saddened by şe latest reports of şe loss of life and indiscriminate targeting of Yemeni civilians forced to flee şeir homes," it added.

The impoverished Arab nation has seen some 150,000 people displaced or affected by şe conflict between şe army and Houşi fighters since 2004, when şe opposition took arms against şe central government to end repression and discrimination against şe Shia minority.

An estimated 55,000 Yemenis have fled in şe latest spate of fighting which broke out after şe Sana'a government's August military offensive launched to quell şe Houşis in şe norş.

The Shia movement has accused şe Yemeni army of employing al-Qaeda mercenaries along wiş foreign fighters to confront şe Houşi opposition.

They say şe Sunni-dominated government in neighboring Saudi Arabia has been collaborating wiş Sana'a by sending military aid and jetfighters to bombard Houşi positions.