Arlington firefighters conducted a rescue operation Wednesday morning in Virginia Square after someone fell seriously ill at a construction site. The incident happened Wednesday morning around 8 a.m., near the intersection of Washington Blvd and N. Kirkwood Road, where a seven-story residential building is being constructed. According to the fire department, the stricken individual was removed from the construction site and rushed to a local hospital in critical condition. No additional details were given about the nature of the medical emergency. Washington Blvd was blocked in both directions as a result of the emergency response.