No mass protests on Labour's Day

As protests on May 1st were expected, Iranian opposition leaders, Mir Hussein Moussavi and Mehdi Karroubi, had called for workers and teachers to join the reformists in a broad-based coalition. But although there have been some protests in Iranian cities during Labour's Day, there haven't been big masses of people on the streets of Teheran. The reason for that is very probably the massive police presence on the streets of Iran's capital, as you can see by quotes of witnesses in The New York Times:

Across Tehran on Saturday, major intersections that had been filled with protesters last summer were filled instead with police officers in riot gear

On last week's wednesday Spiegel Online published an interview with Mehdi Karroubi. The clergyman, who is known as a reformer and is under permanent surveillance by Iranian forces, said he calls on the people for a peaceful assembly on June 15, exactly one year after about three million people had protested on the streets of Teheran. Karroubi told Spiegel that it may be quiet on the streets of Iran right now, but people would just be waiting for a spark to go out again.