Monterey, Calif.

WITH three Afghan government ministries in Kabul hit by simultaneous suicide attacks this week, by a total of just eight terrorists, it seems that a new “Mumbai model” of swarming, smaller-scale terrorist violence is emerging.

The basic concept is that hitting several targets at once, even with just a few fighters at each site, can cause fits for elite counterterrorist forces that are often manpower-heavy, far away and organized to deal with only one crisis at a time. This approach certainly worked in Mumbai, India, last November, where five two-man teams of Lashkar-e-Taiba operatives held the city hostage for two days, killing 179 people. The Indian security forces, many of which had to be flown in from New Delhi, simply had little ability to strike back at more than one site at a time.

While it’s true that the assaults in Kabul seem to be echoes of Mumbai, the fact is that Al Qaeda and its affiliates have been using these sorts of swarm tactics for several years. Jemaah Islamiyah  the group responsible for the Bali nightclub attack that killed 202 people in 2002  mounted simultaneous attacks on 16 Christian churches in Indonesia on Christmas Eve in 2000, befuddling security forces.

Even 9/11 itself had swarm-like characteristics, as four small teams of Qaeda operatives simultaneously seized commercial aircraft and turned them into missiles, flummoxing all our defensive responses. In the years since, Al Qaeda has coordinated swarm attacks in Saudi Arabia, Tunisia, Turkey, Yemen and elsewhere. And at the height of the insurgency in Iraq, terrorists repeatedly used swarms on targets as small as truck convoys and as large as whole cities.