Casablanca, Morocco ? Security agents broke up a group planning terrorist attacks on tourist sites and government facilities, arresting 56 people who included soldiers and the wives of two pilots at the state airline, the Interior Ministry said Friday.

But while the government trumpeted the roundup, analysts said the involvement of security forces and the pilots’ wives in the alleged plot was a troublesome development that showed Islamic extremism is moving out of the North African kingdom’s slums and into the middle class.

The sweep was the latest by Morocco’s government in an anti-terror campaign that began after the Sept. 11, 2001, attacks on the U.S. and intensified following 2003 suicide bombings that killed 45 people in Casablanca and stunned this predominantly moderate Muslim nation.