Mekunu, one of the strongest to hit the Middle Eastern country, was recorded as being equivalent to a category 3 hurricane. Shahriar Alam said many Bangladesh nationals were engaged in fishing out at sea.
Cyclone Mekunu caused flash flooding that tore away some roads and submerged others in Salalah - the country's third-largest city leaving drivers stranded, reported AP on Saturday.
The Saudi meteorological authority said on Twitter Sunday that winds blew at 60 kilometers (over 35 miles) per hour, kicking up blinding dust storms.
The civil aviation authority closed Salalah airport until midnight on Saturday.
The most hard situation is observed in Salalah - the second largest city in Oman, where they were washed away entire roads, brought down street lights and ripped off the roof. The beaches were littered with debris.
Yemenis, Indians and Sudanese were among those missing on the Arabian Sea isle and officials feared some may be dead.
Portions of Salalah, home to some 200,000 people, lost power as the cyclone made landfall. Capt. Tarek al-Shanfari of the Royal Oman Police's public relations department said there had been at least three fatalities in the storm, including the death of a 12-year-old girl who was hit in the head by a door flung open by the wind.
Now it is known about two dead in Yemen and four in Oman, including a 12-year-old girl and an Asian immigrant.
Rescue team found four sailors in their search operations.
Fast-moving waters from the rain and storm surge flooded normally dry creek beds.
"The fourth is a young Omani man who was swept away in his vehicle by flooding", he added.
The moist air mass will also lead to thunder showers and winds, causing blowing sand and dust, especially over the southern parts of the country.