The Registry of Motor Vehicles received but never processed thousands of paper notifications of out-of-state violations by Bay State drivers, a lapse that was only discovered after a Massachusetts driver allegedly killed seven motorcyclists with his pickup truck, according to an internal review by the Massachusetts Department of Transportation.

“The fact the RMV failed to act on information related to the driver responsible for this is deeply troubling and completely unacceptable,” Gov. Charlie Baker said Monday.

Volodymyr Zhukovskyy, 23, of West Springfield, pleaded not guilty to seven charges of negligent homicide after last month’s crash in New Hampshire. Zhukovskyy was driving with a Massachusetts commercial license that should have been suspended after he was charged with operating under the influence and refused to take a chemical test in Connecticut.

The Massachusetts RMV was notified of the incident in May but never suspended his license.

Registrar of Motor Vehicles Erin Deveney resigned over the incident. Acting Registrar Jamey Tesler has begun conducting a review. Preliminary findings, based on the first five days of the review, were released Monday by Transportation Secretary Stephanie Pollack at a press conference with Baker and Lt. Gov. Karyn Polito.

The review identified problems with the state’s processes for processing out-of-state violations for both commercial and personal driver’s licenses.

On the commercial side, the system that suspends drivers’ licenses due to violations is part of a national database and is automated. But if information is not entered in a certain way, the system sends out a notification and RMV officials must review it manually.

According to the review, no RMV employee had actually been reviewing those manual notifications. So there were 365 notices that were triggered but never reviewed, including the one about Zhukovskyy.

Pollack said employees have gone through the entire backlog and did not identify any violations other than Zhukovskyy’s that were serious enough to have warranted a suspension. Most were duplicates of notices that were already adjudicated.

Connecticut also sent a notice of Zhukovskyy’s violation by FedEx. Pollack said in searching for that notification, state officials discovered thousands of notices of out-of-state violations dating back to March of 2018 sitting in a document room at MassDOT headquarters in Quincy. No one had ever read or processed those notices.

There were 53 bins of notices, which the Merit Rating Board had stopped processing, and simply sorted and stored in a records room.

“For the last five days, a team of people has been working nearly around the clock to go through those documents,” Pollack said.

So far, according to the review, staff have issued 655 license suspensions for alcohol-related offenses involving 546 drivers, based on notifications that were stuck in that backlog. Other notifications of serious offenses are still being processed. Pollack said there are “hundreds” of notifications serious enough to potentially trigger a license suspension. She could not provide an exact number.

Pollack said MassDOT has already changed its procedures for handling both the commercial and personal license notifications from out of state. The state is also taking the unusual step of running every Massachusetts driver’s license through a national database to make sure that all violations included in that database have been noted on someone’s Massachusetts driving record.

MassDOT is hiring an independent auditor to review its processes. The state will notify federal oversight agencies of the problems.

Baker said registry staff will “work around the clock” to ensure that any information about dangerous drivers is “properly documented and acted on.”

Asked whether any personnel changes have been made other than Deveney’s resignation, Baker said, “Not at this point.” He did not rule out additional disciplinary actions in the future.

Asked whether she intends to remain in her role as transportation secretary, Pollack said, “The governor has asked me to fix this, and I’m going to fix it.”

Senate President Karen Spilka, D-Ashland, and House Speaker Robert DeLeo, D-Winthrop, both declined to say if they think the Legislature should take on an additional oversight role.

Spilka said the administration is already doing a thorough review, and lawmakers will continue to ask for updates on that review.

DeLeo said similarly, “I don’t think we have enough information at our disposal in terms of whether this is a situation that would require further legislative review.”

This story was updated with comments from Spilka and DeLeo.