The organisers of Sheffield Half Marathon have pledged to take extra caution to ensure the safety of runners following the Boston Marathon bomb attack.
The Sheffield event, which attracts up to 10,000 runners, takes place on Sunday, May 12.
Margaret Lilley, chairwoman of the Sheffield Half Marathon organising committee, said: “The tragic Boston incident has made us all think about the security and safety of our competitors.
“We always work closely with South Yorkshire Police and we will be asking them for advice in this area.”
Organisers also expressed their sympathy for the victims and their families - sentiments which were echoed by the organisers of Sheffield’s Great Yorkshire Run, who said they would be reviewing security arrangements for the 10k race which takes place in September.
A Great Run spokesman said: “We were appalled by the events in Boston.
“On behalf of everyone associated with Great Run, we offer our deepest sympathies to all those affected.
“Our thoughts are with them.
“Mass participation running events are celebrations of community spirit and endeavour - and for this horrific, unprecedented incident to occur is a tragedy.”
Sheffield Hallam University student Anthony Meenaghan took part in the Boston Marathon with his father, also called Anthony.
Mr Meenaghan, 21, is an architectural technology student on a work placement in Boston.
He tweeted: “Thanks for all messages. I’m safe and well. Can’t believe what I saw and heard. Sad day.”
Three people were killed and dozens were injured when two bombs exploded near the finishing line on Monday.