According to a letter Anonymous e-mailed to the press, about 7,000 people protested in more than 90 cities worldwide.
The following day, about 100 people protested in front of the Ministry of Education against this appointment.
They said more than 50 people protested "at a separate location" minutes after bulldozers tore down 30 brick houses on Arshadabad Street.
After the arrests, the radio station said 400 people protested in Tebicuary-Mi.
Outside the building hundreds of people protested against the Iranian president's presence at the assembly.
On 12 February about 300 people protested against the scheme.
Over a thousand people protested in front of the European Parliament office in Warsaw on 24 January.
On 14 March, 110,000 people protested in 450 other German towns, with opinion polls indicating 80% of Germans opposed the government's extension of nuclear power.
Nationwide strikes prompted by the decision, which has doubled gas prices, continued Thursday, as tens of thousands of people protested for the fourth straight day.
About 500 people protested in Aden, calling to "overthrow the regime" and for President Saleh "to leave".