Washington ? The U.S. Secret Service is investigating an online survey that asked whether people thought President Barack Obama should be assassinated, officials said Monday.

The poll, posted Saturday on Facebook, was taken off the popular social networking site quickly after company officials were alerted to its existence. But, like any threat against the president, Secret Service agents are taking no chances.

“We are aware of it, and we will take the appropriate investigative steps,” said Darrin Blackford, a Secret Service spokesman. “We take these things seriously.”

The poll asked respondents “Should Obama be killed?” The choices: No, Maybe, Yes, and Yes if he cuts my health care.

The question was not created by Facebook, but by an independent person using an add-on application that has been suspended from the site.

Because the application was disabled, the responses to the nonscientific polls are not available.