Since 2001, the Oklahoma City National Memorial and Museum has held the marathon to commemorate the bombings in that city, which killed 168 people and injured more than 800 others. But given the events at the Boston Marathon, Oklahoma City marathon organizers are cautiously evaluating security plans and making their decisions one day at a time.

Oklahoma Christian University / Flickr

The Oklahoma Highway Patrol says there have been no threats or heightened security in the aftermath of a bombing at the Boston Marathon - but that senses are heightened.

Oklahoma City Mayor Mick Cornett says there are currently no plans to call off this year's Oklahoma City Memorial Marathon - but said events will be monitored daily.

"Obviously this time of the year on the calendar is a heightened alert in Oklahoma City. It has been for 18 years," Cornett says, referencing the 1995 bombing of the Alfred P. Murrah Federal Building.