Why were these deadly bombs left around to kill?

Do you know what makes a nuclear bomb so deadly?

So we expect to be able to pack deadly bombs into ever smaller, lighter and more harmless looking packages.

A result, the official warned, will be deadlier bombs.

He tossed a hand grenade around the corner, and the house shuddered as the deadly bomb detonated.

Inside the case is a small, deadly bomb, which she secretes under the console.

In addition, 10% of these deadly bombs do not explode: they remain in the ground and have the same effect as landmines.

American commanders say the deadlier bombs could become more common as insurgent bomb makers learn the techniques to make the weapons themselves in Iraq.

Iran could be on the cusp of having at least one workable nuclear weapon within a year and another deadly bomb six months after that.

Why is radioactivity from a bomb so deadly?