The cheating scandal inside the Air Force’s nuclear missile corps is expanding, with the number of service members implicated by investigators now roughly double the 34 reported just a week ago, officials said Tuesday.

It wasn’t immediately clear whether the additional 30-plus airmen suspected of being involved in cheating on proficiency tests are alleged to have participated in the cheating directly or were involved indirectly.

Regardless, a doubling of the number implicated means that approximately 14 percent of the entire Air Force cadre of nuclear missile launch control officers, which numbers about 500, has been removed at least temporarily from active missile duty. It was not clear Tuesday how that affects the mission, beyond requiring the remaining crew members to bear a bigger share of the work.

The officials who disclosed the higher number cheating suspects spoke on condition of anonymity because they were not authorized to disclose the information by name while the investigation is ongoing.

The Air Force announced on Jan. 15 that while it was investigating possible criminal drug use by some airmen, it discovered that one missile officer at Malmstrom Air Force Base, Mont., had shared test questions with 16 other officers. It said another 17 admitted to knowing about this cheating but did not report it.

The 34 officers had their security clearances suspended and they were taken off missile launch duty.

Lt. Col. John Sheets, a spokesman for Air Force Global Strike Command, which manages the nuclear Air Force, said he could not comment on the number of additional officers implicated in the cheating investigation since last week, but he said all are launch control officers at Malmstrom and all have been removed from performing that duty pending the outcome of the investigation.

The Air Force has 450 intercontinental ballistic missiles, or ICBMs, on alert at all times, with a contingent of about 500 launch control officers, some number of which are unavailable on any given day due to illness or other reasons. So the number temporarily unavailable for duty because of the cheating scandal, at roughly 68, is substantial.

Each day, a total of 90 officers work in pairs inside 45 underground launch control centers, with each center monitoring and controlling a group of 10 ICBMs. They work 24-hour shifts in the missile field and then return to their base. They generally do as many as eight of these shifts per month.

The tests in question are designed to ensure proficiency by launch officers in handling “emergency war orders,” which involve the classified processing of orders received through their chain of command to launch a missile. These written tests are in addition to two other types of monthly testing on the missile system and on launch codes.

A “profoundly disappointed” Air Force Secretary Deborah Lee James, the service’s top civilian official, told a Pentagon news conference last week that the alleged cheating at Malmstrom was discovered during a previously announced probe of drug possession by 11 officers at several Air Force bases, including at least two who also are in the nuclear force and suspected of participating in the cheating ring.

The cheating scandal is the latest in a series of Air Force nuclear stumbles, including deliberate violations of safety rules, failures of inspections, breakdowns in training, and evidence that the men and women who operate the missiles from underground command posts are suffering burnout.