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Israeli Prime Minister Benjamin Netanyahu has pledged to fight cyberattacks. REUTERS/Dan Balilty/Pool

JERUSALEM (Reuters) - Hackers posted a bogus announcement of a rocket strike against Israel's Dimona reactor and a possible nuclear leak on a Twitter account used by the Israeli military, which said Friday it was combatting such cyberattacks.

The English-language account, @IDFSpokesperson, has 252,000 followers and usually scrolls out rapid updates on Israel's various fighting fronts. It was inactive on Friday, however, as a military spokeswoman said "several incorrect tweets" were being investigated by Israeli authorities.

She did not elaborate, but the Walla news site published a snapshot of a tweet that had appeared on the account on Thursday night before being removed. It read: "#WARNING: Possible nuclear leak in the region after 2 rockets hit Dimona nuclear facility."

That referred to a reactor in Israel's southern desert, where it is widely believed to have developed nuclear weapons.

Israeli Web sites are frequently the target of pro-Palestinian and Syrian hackers and Prime Minister Benjamin Netanyahu has encouraged investment in national cybersecurity.

The most recent authorised tweet on @IDFSpokesman promised the military would "combat terror on all fronts including the cyber-dimension".