The police are detaining bankers, shopkeepers and journalists on charges of "economic crimes."
After a few minutes agents of Federal Protective Service detained several journalists and photo correspondents.
The police detained more than a dozen opposition leaders and journalists here on Friday, preventing them from flying to a provincial city to take part in anti-Kremlin protests.
This law allowed government authorities to detain journalists without charge.
Security forces, acting under government direction, have occasionally detained journalists and opposition politicians.
In Angola, the police have detained journalists for broadcasting the words of the rebel leader.
When the International Press Institute met here this week, Turkish newspaper editors accused him of running a Government that detains journalists.
On March 8 the Iraqis also released 48 detained Western journalists.
In addition to refusing to grant visas, Bahraini authorities had detained several journalists.
Vietnam must also stop detaining and harassing dissidents and journalists, and its prisoners of conscience must be released.