The said ship was boarded in the Arabian Sea off the coast of Yemen on Thursday.
The incident comes amidst repeated attacks by Houthis on cargo ships in the region.
The details on the current whereabouts of the rune vessel remain unclear.
However, the navigation maritime Bulgare confirmed that one of the ITSS ships was the subject to a security incident located 380 nautical miles east of the Socotra Island of Yemen.
18 crew members were on board, of this number, 8 were Bulgarian citizens, while the rest were from Angola and Myanmar.
In recent weeks, the militant group started targeting commercial ships in the vicinity of the Bab el-Mandeb strait in the Red Sea.
There have been at least 92 attacks on U.S. troops in Iraq and Syria launched by Iranian-backed groups between October 17 to December 12, according to the Pentagon.
Meanwhile, Houthis stated that they attack any vessels that they see as attempting to aid Israel amid the escalation of the war between the Jewish State and Hamas.
Houthis have previously vowed to target any ship heading to Israel until the attack on the Gaza Strip stops.
