The American newspaper has released an ad calling for the assassination of Obama.

Newspaper The Warren Times Observer, published in the Pennsylvania circulation of about 11 thousand copies, published a declaration calling for the assassination of U.S. President Barack Obama.
Text ads read: "Let Obama be followed for the Lincoln, Garfield, McKinley and Kennedy." See respective newspapers here (format PDF).
The newspaper apologized, calling the publication problem. In the editorial explained that the officer who took the ad does not seem to have drawn attention to the fact that Obama was mentioned in a number of dead American presidents.
The Warren Times Observer reported on the publication of the local police and U.S. secret service, which ensures the safety of the president. The identity of the person who filed the ad is set, but his name was not called. In the Secret Service said that it was very serious about happened.