Nail bombs or irregular water - supply. Which would you choose?

Nail bombs or irregular water - supply

People in London are used to bomb scares, and also the occasional bomb explosion, courtesy of the IRA (the Irish Republican Army). If you travel on the underground rail network, security alerts are common, and you will not find rubbish bins on the trains or at the train stations for fear that the IRA will put explosives in them.
But the two 'nail' bombs that exploded in London in the past few days were different from the usual IRA bombs (a 'nail' bomb is exactly that a bomb which contains large nails, with obvious results). The first exploded in Brixton, a part of London with a predominantly Afro-Caribbean population. The second one went off in Brick Lane in east London, where there is a high percentage of Bangladeshi immigrants. In both explosions, many people were badly injured though luckily no one died.
The fact that the bombs went off in areas with large immigrant populations appeared to indicate that the attacks were racist. Several extremist groups claimed responsibility.