The Financial Post reports in its Tuesday edition that Avatar: Fire and Ash kept on smouldering at the box office, taking the top spot for a fourth straight week on a relatively quiet weekend. An Associated Press dispatch to the Post says the third chapter in James Cameron's Pandora epic brought in $21.3-million in North American theatres, according to studio estimates Sunday. In total after four weeks, the Disney/Cameron production has grossed $342.6-million in North America and $888-million in the rest of the world. The week's top-grossing new release was Paramount Pictures rampaging-chimp horror film Primate, which earned $11.3-million domestically and $13.4-million worldwide. The Sydney Sweeney-driven thriller The Housemaid continues to be a good earner for Lionsgate. It collected $11.2-million in North America in its fourth weekend for a total of $94.15-million.