Rebels say they fired long-range missile at port city of Dammam in Saudi Arabia, hundreds of kilometres away.
On Thursday, Houthi rebels launched a medium-range ballistic missile and armed drone targeting a military parade in the southern city of Aden.
The camp is a base for UAE-trained and supported units.
Among those killed was a senior military commander, General Muneer al-Yafee, a leading figure of the southern separatists also known by his nickname Aboul Yamama. He was reportedly giving a speech at the time of the attack.
This attack, however, was not the only message the rebels sent on Thursday, they also said they had fired a long-range missile at the port city of Dammam in Saudi Arabia, hundreds of kilometres away.
A first in this Saudi-led 4-year-long war.
Al Jazeera’s Stefanie Dekker reports.