A photographer captured these dismal photos of life in North Korea on his phone

Children walk to school in Tumangang, North Korea, in August 2015.Xiaolu Chu/Getty

As North Korea continues its saber-rattling about nuclear strikes, we still know little about the country.

The North Korean government is notoriously secretive. Upon entering the country, visitors are instructed on what they can and cannot take pictures of. Customs agents inspect your cellphone and other digital devices, including cameras, tablets, and storage cards, for banned content.

These restrictions prompted Getty photographer Xiaolu Chu to travel by train through the country in August 2015, documenting everyday life through his phone lens. He told Business Insider it was too risky to use a high-end camera because locals would report him to the police.

While some images were deleted during run-ins with the police, Chu shared some snapshots with us. Take a look at life inside North Korea.