Four bombs exploded during a World Outgames track and field event Tuesday, injuring one runner, eye-witnesses reported.

Keith Little and Sam Felker, a Nashville couple competing in the games, wrote about the incident at their blog

One runner was treated on the scene for a minor hand injury after two bombs detonated during an afternoon track event. The devices appeared to have been tossed from a nearby church tower, the men said.

While police searched the premises, two more bombs exploded, this time no injuries were reported.

“We are all stunned by this turn of events,” the men said. “We are also determined that this will not stop or spoil the Outgames.”

Felker is in Copenhagen, Denmark to compete in a triathlon, while Little is defending gold medals in the javelin throw and hammer.

The incident comes on the heels of a gay bashing incident that marred the opening of the games on Saturday.

Police say three men – from England, Norway and Sweden – were punched and kicked in Copenhagen's gay district, the Vester Voldgade and Studiestraede area of the city. Witnesses say they heard the attackers yell “homo pig” as they assaulted the men. The three men escaped serious injury but were treated at a local hospital.

Two Danish men, 28 and 33, were detained by police who are treating the assaults as hate crimes. A judged ruled on Sunday to keep the men in custody until August 4, two days after the conclusion of World Outgames. The judge said that to release the men before the end of the gay festival would “affront the public's sense of justice.”

Outgames organizers called Saturday's attack an “isolated” incident.

After today's incident, police collared one suspect and continue to search for a second, according to the blog post.

World Outgames is the nine-day LGBT festival that combines sport, culture and politics. Over 5,000 athletes are expected to compete in more than 30 events in Denmark's capital. The games opened on Saturday.

Denmark's commitment to gay rights includes granting civil unions to gay men and lesbians in 1989.