Yemen’s Houthi fighters say that US fighter jets have launched 28 attacks on the northwestern province of Sa’ada.

The US has used modern fighter jets and bombers in its offensive against the Yemen fighters, Houthis said in a statement.

According to the statement, the US fighter jets have launched overnight attacks on the Yemeni fighters, the Arabic Almenpar website reported.

The development comes as The Daily Telegraph on Sunday reported that the US has sent special forces to Yemen to train its army.

The reports of the US military intervention in Yemen come as Saudi Arabia is also lending full support to the Yemeni government’s crackdown on Yemen’s Houthi minority.

Saudi Arabia has launched cross-border ground attacks against Yemeni fighters and its fighter jets have reportedly dropped phosphorus bombs on Yemen’s northern areas.

International aid agencies and some UN bodies including United Nations Children’s Fund (UNICEF) and UN High Commissioner for Refugees (UNHCR) have voiced concern over the dire condition of the Yemeni civilians who have become the main victims of the conflict in the country.

The United Nations which according to its charter is set up “to take effective collective measures for the prevention and removal of threats to peace, and for the suppression of acts of aggression or other breaches of the peace” has failed to adopt any concrete measures to help end the bloody war.