San Francisco police are investigating why a set of spiked baseball bats were chained to telephone poles around San Francisco on Thanksgiving, which a spokesman said was "very strange."

As many of 27 of these bats, some of which had nails protruding from them, were found in a number of locations around the city, Sgt. Michael Andraychak said.

The bats were discovered throughout Thursday, beginning in the morning. The last one was found at around 4:45 p.m. at 19th Avenue and Buckingham Way, Andraychak said. Gerrie Burke snapped a photo of the odd sight -- a bat attached to a pole meter as if it were a sleeping dog.

"I thought it was someone trying to be sick, then I thought it's an art project," Burke said. "And then I thought maybe they are trying to freak people out."

Andraychak said there are no indications currently of who placed the bats or why. Police are investigating various aspects of what Andraychak described as a "very strange" episode.

Police said possession could be considered a probhibited deadly weapon with a felony charge.

Bay City News contributed to this report.

