Manila demanded an explanation on Thursday after its ambassador to Kuwait was expelled, shocking Philippine authorities and deepening a diplomatic row over the treatment of domestic workers in the Gulf state. The two nations had been working to resolve differences sparked by the murder of a Philippine maid, whose body was found stuffed in her employer’s freezer in Kuwait earlier this year. But relations plunged after the Philippines released videos last week of embassy staff helping Filipino workers flee from allegedly abusive employers, which Kuwait called a violation of its sovereignty. The Philippine Foreign Secretary Alan Peter Cayetano apologized, but Kuwaiti officials announced Wednesday they were expelling ambassador Renato Villa and recalling their own envoy from Manila.