Baltimore police released tapes of two 911 calls the man made Aug. 26, while the Orioles were out of town for a game against the Boston Red Sox, and the voice on the calls claimed he had planted a bomb at Oriole Park at Camden, The Baltimore Sun reported Tuesday.
"Y'all got 20 minutes to get there," the man said in the first call.
A different dispatcher asked the man during the second call why he would plant a bomb at the park.
"'Cause I'm tired of Baltimore," the man responded.
The caller gave his name as "Killer," police said.
Police searched the stadium and determined the bomb threat was a hoax.
No arrests had been made in the case as of Tuesday afternoon.