An investigation of city computers found that dozens of employees frequented pornographic Web sites at work and clicked on thousands of images, the mayor said Wednesday.

As many as nine district workers from various agencies, including the Child and Family Services Agency, will be fired after an internal investigation found that each had clicked on porn images more than 19,000 times last year, Mayor Adrian Fenty said.

An additional 32 employees who each visited porn sites more than 2,000 times last year will be suspended or reprimanded, he said.

The investigation did not reveal any evidence of child pornography, said acting D.C. Attorney General Peter Nickles.

The probe of 10,000 city computers was launched last month after the city received a complaint from an employee about other workers browsing and downloading pornographic content on government computers. Officials eventually uncovered abuse at 18 agencies.

The city has installed filtering software on its computers that is supposed to block access to porn sites and display a message informing the user of the city's Internet policy.