Wichita ? Two letters threatening to shoot police officers have been traced to a 14-year-old boy who said he was mad at his parents and thought the letters would be funny.

Police characterized the letters – the first found May 8, the second Thursday morning, both at a Wichita apartment building – as “extremely serious in their content.”

“We were very concerned about officer safety, more so than we usually are,” said Deputy Police Chief Tom Stolz. “If he had the ability to write that kind of language, he has the ability to carry out that kind of conduct.”

The first letter claimed responsibility for shooting an off-duty police officer in an alley next to the downtown campus of Wichita Area Technical College on March 25, but police don’t believe the teen did it.

In the second letter, the boy wrote that he was going to kill people while they were delivering newspapers.