Czech police and prosecutors say they believe a top aide of Prime Minister Petr Necas ordered a military intelligence agency to illegally spy on three people.

Prosecutor Ivo Istvan said Friday that Jana Nagyova, the head of the prime minister's office, was charged with abuse of office. Six others, including the present and former heads of military intelligence and two members of Parliament, also face charges of abuse of power and corruption.

Istvan says that Nagyova is suspected of directing the alleged illegal surveillance. The CTK news agency quoted Nagyova's lawyer as saying the alleged targets of illegal spying included Necas' estranged wife.

In their first explanation for the sweeping raids of government offices and other locations, authorities said Friday that Nagyova's motives were "purely private." They did not elaborate.