Police have shut down parts of downtown Pflugerville, an Austin suburb, due to a report of a suspicious package, the city’s police chief said early Wednesday. It is not yet known whether the incident is related to the Austin bombings.

The news came the day after investigators linked a fifth bomb blast at a FedEx ground delivery facility northeast of San Antonio to the deadly package bombs in Austin. A sixth blast at a south Austin Goodwill store was not related to the bombings, investigators said.