Medical sources in the rebel-held port of Hodeida some 150 kilometres to the north said that at least 30 rebel fighters were killed in the battle for the town and scores wounded.
Loyalist commander Abdulrahman Hajari said a number of rebels had been captured as his forces entered the town.
The retaking of Hays is a boost for government forces who have been hit by deadly infighting in their own ranks.
Late last month, southern separatist militiamen who are a key component of the forces loyal to President Abedrabbo Mansour Hadi overran the main southern city of Aden and surrounded government ministers in the presidential palace.
The two main players in the coalition supporting Hadi -- Saudi Arabia and the United Arab Emirates -- are still trying to broker a new political compromise.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)
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