For years, the British Challenger 2 tank has been considered one of the toughest armored vehicles on the planet. Only a fellow Challenger 2, during a friendly-fire incident in the early days of the Iraq war, had managed to get through its seemingly-impervious Chobham armor.

Until now. A Challenger "has been badly damaged for the first time by a roadside bomb in Iraq," the Telegraph is reporting.
Professor Michael Clarke, from King's College's Defence
Studies centre, told the BBC that the tank's armor was ordinarily "inviolable."* *
DANGER ROOM's David Hambling wonders if this is the work of an "explosively-formed penetrator," one of the the so-called "superbombs" that have turned up with increasing frequency in Iraq. The weapons -- closed associated with "shaped charges" -- are perhaps the deadliest arms in the insurgent arsenal.
A Ministry of Defence spokesperson seemed to confirm that, with a non-denial kind of denial to the Telegraph.
He refuted that the tank "had been damaged by a new type of 'shaped charge' IED, which concentrates the force of an explosion.
"It is not some sort of escalation. We would dispute the fact that it’s a new bomb," he added. "It was an improved explosive device and the technology is at least 50 or 60 years old."
Shaped charges are go back, at least that far.
(High five: PB, JQP)