The Iranian authorities moved Thursday to project the appearance of normalcy after a week of violent protests over gasoline price increases, partly restoring internet access and decreeing that the mayhem that convulsed the country was really a foreign-backed failure.

But other developments suggested that a severe crackdown was underway in response to the street clashes, rioting and destruction that had upended life in dozens of Iranian cities and towns — and that the uprisings had not been completely crushed.

Doctors reported that hospitals were overfilled with people injured in the protests. They also said the Health Ministry had ordered all hospitals in Tehran and other cities to cancel elective surgeries because of the influx of emergency cases.

Iran’s student union said plainclothes agents of the pro-government Basij militia, hiding inside ambulances to evade restrictions on entering campuses, had seized more than 50 students at Tehran University after protests there.