The Boston Marathon is the oldest and most celebrated of the mass marathons. Monday's Boston was to be my fourth. I was running as a fund-raiser, this time for the Michael Lisnow Respite Centre.
Angela Clarke had stood for hours in the 10-deep crowds near the Boston Marathon finishing line before catching a few frames of her husband, Adam, as he pounded his way towards his best run yet.
The number of casualties of the attack at the Boston Marathon has risen to 176, with 17 in critical condition.
The open nature of the marathon event on public roads provides opportunities for people from terrorists to local cranks, yet no more so than with cycling races.
The vision is terrifying. A flash of orange light and a plume of smoke rises from the sidelines of the Boston Marathon. After the initial shock and frantic rush, it became clear that this was the first bomb blast to rock the historic race.
As any amateur runner will tell you, crossing the line in a big race is a hugely emotional moment. It matters not whether it's a full marathon, a half or even one of the longer ultra-marathons that are becoming increasingly popular. It's always a big deal.
Run 200 metres past the first Boston Marathon bombings site and past the unexploded third bomb. Then turn right then left and you pass the Revere Hotel.
Emergency wards across Boston are overwhelmed with more than 130 people injured in the bomb blasts that rocked the city's famous marathon, killing at least three.
Australian Craig Doherty was walking back to the finishing line at the Boston marathon when an explosion tore through a group of spectators.
Read the full statement by US President Barack Obama on the Boston Marathon bombings