Rescue team found four sailors in their search operations. Large areas of Dhofar and al-Wusta provinces were flooded due to which people living near both the areas had to be moved to safety, BBC reported.
Omani forecasters said Salalah and the surrounding area would get at least 200 millimetres of rain, over twice the city's annual downfall.
A view of Cyclone Mekunu that hit Oman.
The NCM also predicts that Mekunu will intensify into a Category 2 cyclone over the next 12 hours, with an expected wind speed of between 155 to 165 km/h.
Cyclone Mekunu has now been downgraded to the category of "deep depression".
India's Meteorological Department said the storm packed maximum sustained winds of 170-180 kilometres per hour with gusts of up to 200kph. Three Asians who were wounded by the cyclone were rescued. Yemenis, Indians and Sudanese were among those missing and officials feared some may be dead. The governor of Yemen's Socotra said two Indian sailors had died in the storm, AFP reported. Salalah's airport opened on Sunday after being closed for three days. Authorities said however that schools would remain closed until Monday.
The main road linking the airport to Hadibo, the island's main city, has been reopened, Mahrous said. The island of Socotra has been declared a disaster zone by the government.
The Yemeni high relief agency met with worldwide humanitarian organizations in Aden late Thursday to discuss the situation, the country's Saba news agency reported.
Eleven people have been killed in a ferocious cyclone in Oman.