Mr. Alexander said investigators would know soon whether this bomb was similar in makeup to the one used in the still unsolved bombing in Centennial Olympic Park last summer.

And you learn of the 50 unsolved bombings against black citizens or institutions from the late 1940's to the mid 1960's that gave the town its nickname, Bombingham.

Stockholm has more urgent concerns about its bid - two recent, unsolved bombings of stadiums in Sweden and indifferent public support for the Games.

But as these efforts faltered and Moscow and other cities were hit by still unsolved bombings, the Kremlin went on the offensive.

An unsolved bombing at Atlanta's Centennial Olympic Park in 1996 killed one person and injured about 100.

June 11, 2001: An unsolved bombing at a clinic in Tacoma, Washington destroyed a wall, resulting in $6,000 in damages.

Mr. Karimov has used an unsolved February 1999 bombing, which some believe was carried out by the security forces, as a justification for an even wider crackdown.

Fifty unsolved racially motivated bombings between 1945 and 1962 had earned the city the nickname "Bombingham".

It also saw its downtown compared to a flea market and an unsolved bombing that marred the games.

The government blamed a series of unsolved bombings in 1999 that killed more than 300 people on Chechen Muslim terrorists.