By John McDevitt

PHILADELPHIA (CBS) — The recent tragedy at the Boston Marathon has officials here in Philadelphia enhancing security measures for the Broad Street Run, this Sunday.

Runners and spectators are being asked to do their part in the name of safety.

Officials say there will be an increased police and emergency personnel presence.   Cameras will be scanning the crowd and course.

Today, Mayor Nutter asked runners and spectators to take some additional safety precautions, such as registering with an emergency alert texting system,

“This is one way that race officials will alert participants if there is any particular emergency on race day,” the mayor said today.  “Additionally, there will be public announcement systems at every water station along the race course which will also be used in the event there is any kind of an emergency.”

The mayor also was strongly discouraging spectators from bring backpacks to the race.

The mayor says three high schools have been designated as emergency shelters along the course: South Philadelphia High School, at Broad and Snyder; the High School of Creative and Performing Arts, at Broad and Christian; and Benjamin Franklin High, at Broad and Spring Garden.

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