JAKARTA - Tens of thousands of Indonesian police switched to high alert on Friday amid threats of extremist attacks over the holiday period, five years after deadly Christmas Eve bombings.Some 61,000 security forces were fanning out across the worldâs most populous Muslim nation, as Christians, who comprise about five percent of Indonesiaâs more than 220 million people, prepared to attend weekend church services. âFull alert status is in place across the country as of today (Friday). This is a centralised operation,â national police chief deputy spokesman Anton Bahrul Alam told reporters.