The Boston Athletic Association has opened registration for the 2014 Boston Marathon, which is set to take place in seven months.
Runners were able to begin registering for the race at 10 a.m. Monday.
"We expanded the field by 9,000 runners with the anticipation that there would be a heightened interest in running the 2014 event," said Marc Davis, a BAA spokesman, adding, "We expect to sell out."
The field size for the 118th Boston Marathon will be 36,000 runners. For the three previous marathons, the field size was 27,000.
Organizers said they worked with the state, as well as the eight cities and towns along the marathon route, to increase the field size.
The Boston Athletic Association posted a statement on its website informing runners of changes:
Please be aware that as we receive application submissions for the 2014 Boston Marathon, we continue to work on changes which will be evident and in effect at the event.
The 2014 Boston Marathon will be a special event for the City of Boston and all of the municipalities along the course, as well as the sport. The B.A.A. and all involved with producing the event and staging the race are committed to retaining the characteristics which make the Boston Marathon unique. As we seek to do this, official entrants (registered participants), volunteers and spectators may be asked for additional cooperation in certain areas, including transportation, baggage and other logistics.
Among the changes, it is anticipated participants will be asked to submit to security checks of their personal belongings. Participants may be asked to significantly reduce, or eliminate, the belongings that they carry with them on the transportation provided by the B.A.A. and into race areas.
Participants should be prepared for the possibility that the checking and pick-up of personal belongings will not be allowed.