The raids in Cairo and other cities appeared to be an effort by the ruling military to intimidate nongovernmental organizations that it accuses of promoting a "foreign agenda" and supporting protests against its rule.
Dozens of police officers, military personnel and judicial officials held and interrogated staff members for several hours, confiscated computers and documents, and closed at least five of the offices, the agencies said. They said the searches were conducted without warrants.
"The raids today represent an escalation of repression unheard-of even during the Mubarak regime," said David J. Kramer, the president of Freedom House, a U.S.-based pro-democracy group whose offices in Cairo were among those raided.
"These actions come in the context of an intensive campaign by the Egyptian government to dismantle civil society through a politically motivated legal campaign aimed at preventing 'illegal foreign funding' of civil society operations in Egypt."