There are around 18-24,000 registered madrassas in Pakistan. There are countless more unregistered seminaries.
There are as many as 83 illegally constructed mosques and seminaries in Islamabad alone.
The ministry of interior provides madrassas including illegal ones with walk-through gates, along with police officials for security.

[youtube]http://www.youtube.com/watch?v=xB20-p0-jzU[/youtube]