Rights activists say the crackdown has centered on supporters of evictee Fan Mugen, jailed in 2015 for killing two demolition gang members.
The top floors of many buildings are empty or inhabited by homeless children.
Local offices of the State Security Agency demand goods in exchange for the issuance of travel certificates.
Two children die and more than 20 are sent to hospitals after the deadly stampede in a Chinese school.
The match comes at the height of bilateral tensions over the deployment of a U.S. missile defense system by Seoul.
The two countries recently extended cooperation on border issues, including drug running.
A French reporter and three traveling companions are questioned for hours on arrival and ordered to leave the next day.
Ongoing clashes between Myanmar ethnic armies and government forces are disrupting stability in the border area.
Phan Kim Khanh and Bui Hieu Vo are being detained for posting online content described as fabricated and malicious.