Taiwan’s defence ministry said it had detected six more Chinese balloons flying over the Taiwan Strait on Sunday, one of which crossed the island, the latest in a spate of such balloons the ministry says it has seen over the past month-and-a-half.

The ministry earlier this month, in a strongly worded statement, accused China of threatening aviation safety and waging psychological warfare on the island’s people with the balloons, days before Taiwan’s Jan. 13 elections.