"I wonder if there will be problems at the Olympics during an event I attend," Fan said. "Then again, I've been a bit concerned the whole time, not just now. But when I see the increased number of police officers, I relax a bit. The government has placed a great importance on our safety."
Fan, who regularly rides the subway, has faith in Beijing's public transportation.
"I'm sure I'm just worrying too much," she told ABC News, "but I don't worry on the subway, it feels normal. Those security exams are quite thorough and if there is someone with something, they will definitely get discovered."
Jon Morales, a New Yorker who previously lived in Beijing for two years and has returned to watch the Olympics, wonders how Chinese authorities will react to potential incidents starting Friday.
"I'm worried about an overreaction by the police," Morales told ABC News. "I think we've seen they're not the most politically sensitive or aware police force in the world and can be pretty heavy handed at times."