The FBI is investigating the hacked cellphones of several Democratic Party officials with the belief the attacks are connected to a spate of breaches at party networks and under the assumption that Russia is behind the hacking, Reuters reports.

The phones, says the report, were hacked within “the past month or so.”

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That would put the timing of the breach soon after hackers, widely suspected to be Russian intelligence, were booted from the Democratic Congressional Campaign Committee. The DCCC breach, in turn, took place shortly after the same hackers were kicked out of the Democratic National Committee.

Many members of Congress have grown frustrated with the administration not formally accusing Russia of the hacking spree, including House Homeland Committee Chairman Michael McCaul (R-Texas) and House Minority Leader Nancy Pelosi (D-Cali.), who have both asked Obama to acknowledge Russia is behind the attacks.