Mass arrests of Muslims in LA ( I don't remember this)

From Thursday, 19 December, 2002 , I don't recall this happening.

US immigration officials in Southern California have detained hundreds of Iranians and other Muslim men who turned up to register under residence laws brought in as part of the anti-terror drive.

Reports say between 500 and 700 men were arrested in and around Los Angeles after they complied with an order to register by 16 December.
People went down wanting to co-operate and then they were detained
Ramona Ripston civil liberties leaderThe Immigration and Naturalization Service (INS) is refusing to say how many people were arrested but said detainees were being held for suspected visa violations and other offences.

The arrests sparked angry protests in Los Angeles by thousands of Iranian-Americans waving banners which read "What's next? Concentration camps?" and "Free our fathers, brothers, husbands and sons".
Official radio in Iran also reported the arrests and the protests, which it said were mounted by families of the detainees who converged on Los Angeles.

Entire article here.