WASHINGTON – Homeland Security Secretary Jeh Johnson on Monday directed the Transportation Security Administration to revise airport security procedures, retrain officers and retest screening equipment in airports across the country.

Johnson’s directives come after the agency’s inspector general briefed him on a report analyzing vulnerabilities in airport security – specifically, the ability to bring prohibited items through TSA checkpoints.

Johnson would not describe the results of the classified report, but said he takes the findings “very seriously.”

ABC News first reported Monday that undercover agents were able to smuggle prohibited items, such as mock explosives or weapons, through TSA checkpoints in 67 out of 70 attempts. ABC cited anonymous officials who had been briefed on the inspector general’s report.

In a statement issued Monday evening, Johnson said: “The numbers in these reports never look good out of context, but they are a critical element in the continual evolution of our…