In this image made available by the Icelandic Coastguard taken Wednesday April 14, 2010, smoke and steam rises from the volcano under the Eyjafjallajokull glacier in Iceland, which erupted for the second time in less than a month, melting ice, shooting smoke and steam into the air and forcing hundreds of people to flee rising floodwaters.
The volcano with the unpronounceable name may keep some Chicago marathon runners at the starting line.
"We're frustrated. Obviously we'd like to go and run the race that we've been training for and do what we set out to do," said Dan Lakin, one of the eight runners trying to get to the United Kingdom.
The eruption of Iceland's Eyjafjallajokull, which began last week has grounded much of the European airspace and hampered others from getting across the pond.
The team says they've raised over $24,000 to fight HIV/AIDS and have trained for over five months for the 26.2 mile run.
"I feel I trained pretty hard during the winter to be able to run a personal best, so I was looking forward to the race, and the crowds that I heard in London are really excellent and really turn out to support the runners," said runner Jennifer Chang.