RIO DE JANEIRO — Sabotage by unhappy workers may have caused water and gas leaks, blocked toilets and electrical faults that slowed teams from moving into the athletes’ village, Rio Olympic organizers said Thursday. All 31 buildings at the huge compound for 18,000 athletes and staff are due to be ready at the end of Thursday, with the games opening in just over a week. South America’s first Games have been plagued by problems, including the Zika virus, severe water pollution, security worries and slow ticket sales. Australia refused to check in at Sunday’s official opening, setting off public complaints by at least a dozen teams. “One US official told me the workers were unprepared, working with water on the floor, working with electricity and wearing no protection; wearing flip-flops,” Andrada said. Brazilian labor inspectors on Wednesday said they would fine the organizing committee nearly $100,000 for hiring workers without proper contracts required by law.