Baltimore-area authorities announced heightened security after
At least three people were killed and scores were injured in the blasts, which occurred at the finish line of the marathon.
Public safety officials described checks on "critical infrastructure" as a precaution. Baltimore police said fans at Tuesday's game between the
"We do not discuss ballpark security measures in detail, but
The blasts put police on alert in major cities across the United States, including in Washington and New York City, sites of the Sept. 11, 2001, terrorist attacks.
"There's no credible threats to Baltimore; we've received no intelligence," Guglielmi said. "This is just proactive planning, given what's happening" in Boston.
Vice President Joe Biden was scheduled to be in Baltimore on Tuesday evening for an event previewing the new
Baltimore County Police Chief
Baltimore Sun reporter Eduardo A. Encina and Reuters contributed to this article.