DUBAI, United Arab Emirates -- The state news agency of the United Arab Emirates says the number of its troops killed in Yemen has risen to 45.

It appeared to be the deadliest day ever for the Emirati military since the founding of the UAE federation in 1971.

In a one-line statement, WAM news agency said 23 troops died of their wounds, after reporting earlier Friday that 22 had been killed while taking part in Saudi-led operations in Yemen against Shiite rebels known as Houthis.

Pro-government Yemeni security officials said the troops were killed Friday when a Houthi missile hit a weapons storage depot near their position in the province of Marib, about 120 kilometres (75 miles) east of the capital Sanaa.