A team of security researchers may have found a way to remotely penetrate the defenses of Apple’s latest mobile OS, making them eligible for a $1 million reward.

The money was offered in a contest run by a Washington, D.C.-based company called Zerodium, which is in the controversial business of buying and selling information about software vulnerabilities.

It congratulated the winning team on Twitter Monday, though it didn’t identify the researchers, which made its claim about finding a new security hole in iOS 9 impossible to verify.

Apple officials didn’t immediately have a comment.

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