spar over COVID-19 in U.S. vice presidential debate— Trump hails experimental treatment for his virus recovery— Sri Lanka closes key state offices as virus outbreak surges— Follow AP’s pandemic coverage at http://apnews.com/VirusOutbreak and https://apnews.com/UnderstandingtheOutbreak___HERE’S WHAT ELSE IS HAPPENING:COLOMBO, Sri Lanka — Authorities in Sri Lanka have closed key government offices and further expanded a curfew to contain a surging coronavirus outbreak.The foreign ministry closed the consular affairs office for the week and suspended all services to prevent the public from congregating.