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Why the Times Square bomb failed spectacularly

The Times Square bomb failed to go off because it was badly constructed and poorly designed. But other bombs made of easy-to-obtain ingredients have caused mayhem, which analysts say was the intent in New York City, too.

By Staff writer / May 3, 2010

Police officers look on at the intersection of 45th Street and Seventh Avenue in Times Square in New York, Sunday. The Times Square bomb failed on Saturday, but other bombs made of easy-to-obtain ingredients have caused mayhem.

David Goldman/AP



Why didn’t the Times Square bomb explode? It failed to go off because it was both badly constructed and poorly designed, say experts.

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The homemade bomb – discovered as it fizzled and smoked at a landmark US crossroads – was a strange combination of ingredients, notes John Pike, head of

It was composed of gasoline, propane tanks, fertilizer, and consumer-grade fireworks, according to information released by New York City police. But gasoline does not explode – it burns. Propane does explode, but only when mixed with air in precise quantities. And the fertilizer doesn’t appear to have been mixed with fuel oil, which is a prerequisite to making the sort of fertilizer explosive with which Timothy McVeigh destroyed the Oklahoma City federal building.

Even bungled attacks can be serious, however.

“Just because [the perpetrator or perpetrators] was incompetent doesn’t mean they didn’t have evil intent,” says Mr. Pike.

Alarm clock and fireworks

According to police, the detonating agent of the car bomb was a cheap-looking alarm clock attached to a 16-ounce can of fireworks – the sort of small explosives one can buy at roadside stands in certain states before the Fourth of July.

New York's mayor noted that the fireworks could have been purchased in Pennsylvania and driven into New York City. The wiring linking the bomb’s parts together appeared crude, he said.

“It looked amateurish, I think, is a nice way to phrase it,” Mayor Michael Bloomberg told reporters following the attack.

The fireworks were supposed to detonate gasoline cans and propane tanks packed in the sport utility vehicle used for this wheel-borne improvised explosive device (IED). The final piece in the hoped-for chain reaction of the bomb was a larger box – a gun locker – filled with 200 to 250 pounds of fertilizer.

Initial police reports indicate that the fertilizer was not the grade of ammonium nitrate used by Mr. McVeigh to terrible effect. McVeigh’s bomb, at some 4,000 pounds, was also much larger.

'Call it a terrorist act'

But even a small bomb, properly constructed, could have caused havoc in the close quarters of Times Square. To park a car bomb there shows that the perpetrator was intending to make a statement and cause the maximum amount of damage possible, says Pike.

To him, that’s terrorism, whether of domestic or international origin.

“I would go ahead and call it a terrorist act,” he says.