Blackstone Group (BX.N) is in advanced talks to pay $400 million for 40 percent of privately held Israeli firm NSO Group, a maker of spyware for mobile devices, Israel’s Calcalist business newspaper reported on Sunday.

Another investor – ClearSky – is expected to join Blackstone in the deal as a secondary buyer for 10 percent, Calcalist said.

An NSO spokesman said he could not confirm the report. Blackstone, a New York-based buyout firm, was not immediately available to comment. ClearSky did not immediately respond to a Reuters’ request for comment.

NSO has come under international scrutiny in recent months amid allegations the Mexican government has used NSO’s Pegasus mobile spyware to target private citizens.

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