Is this real?

I saw this today and wondered if this was real or exagerated.

NOTE: FROM SHANGHAI POLICE

All foreign teachers/expats are required to carry their passport with them at all times, 24 hours a day; 7 days a week.
All foreign teachers/expats are required to register with their local PSB (Police Station) within 24 hours of arrival/issuance of a new visa or change of any details.
All foreign teachers/expats are required to return to their own place of residence each night or notify the local PSB if they are staying in another residence after 11pm, EACH NIGHT.
All foreign teachers/expats who travel outside of Shanghai must have a clearance letter from their employer and their employer must be aware of ALL and ANY travel arrangements.

ADVICE: FROM SHANGHAI POLICE

All foreign teachers/expats should avoid from "socialising" within local area of any of the EXPO sites.
All foreign teachers/expats should avoid plane travel or long distance travel rail/bus travel.

The Shanghai and district PSB have tightened up on these requirements and WILL be checkingone in ten foreigners at their residences and on the streets. I have been advised by [redacted] that teachers should avoid travel / or trips out of shanghai and should be extremely careful when travelling [sic] within Shanghai over the next few months.

It sounds really quite scary!  Why does this EXPO attaract this attention from the police?