Brazen cross-border smugglers have made a comeback and are suspected of moving more than 100 tonnes of frozen meat every night from Hong Kong to mainland China, the Post has learned. Customs officers have kept up pressure on them, confiscating 224 tonnes of frozen meat worth nearly HK$35 million (US$4.5 million) in the first half of this year, almost two-thirds more than in the same period last year. Over the past four weeks, police and customs officers foiled three smuggling operations, seizing 139 tonnes of meat worth HK$16 million and arresting 16 people. Law enforcement sources said the illegal activities…