South Korea held a nationwide civil defense drill for the first time in six years on Wednesday, as a part of bolstered responses to North Korea’s repeated missile launches.

The drill, based on a North Korean air raid scenario and lasting 20 minutes from 2 p.m., required South Korea’s 51 million residents to practice evacuating to shelters or underground spaces such as train stations.

While government officials took part in the drill, posts to social media appeared to show that a number of residents, businesses, shops and restaurants went about business as usual, largely ignoring the drill.