Taiwan, which China claims as its own territory despite the strong objections of the government in Taipei, has complained since December about the balloons, saying they are a threat to aviation safety and attempt at psychological warfare.

In its daily report on Chinese military activities, Taiwan's defence ministry said it spotted the first balloon on Saturday morning and the last one mid-afternoon, having spotted the same number of balloons on Friday.

Five crossed the northern and central part of Taiwan, according to a map provided by the ministry.

China's defence ministry did not answer calls seeking comment on Sunday. Both China and Taiwan are currently celebrating the Lunar New Year holiday, the most important festival in the Chinese-speaking world.

Last month, China's government dismissed repeated complaints by Taiwan about the balloons, saying they are for meteorological purposes and should not be hyped up for political reasons.

Chinese warplanes operate daily in the Taiwan Strait and often cross its median line that previously served as an unofficial barrier between the two sides. China says it does not recognise the existence of that line.

Taiwan last month elected Vice President Lai Ching-te as its next president, a man China describes as a dangerous separatist.

Lai, who takes office in May, has offered talks with China, which have been rejected. He says only Taiwan's people can decide their future.

The potential for China to use balloons for spying became a global issue last February when the United States shot down what it said was a Chinese surveillance balloon. China said the balloon was a civilian craft that accidentally drifted astray.

(Reporting by Ben Blanchard; Editing by William Mallard and Sonali Paul)