Remember when I said that I keep my home wireless network open? Here's a reason not to listen to me:

When Indian police investigating bomb blasts which killed 42 people traced an email claiming responsibility to a Mumbai apartment, they ordered an immediate raid.

But at the address, rather than seizing militants from the Islamist group which said it carried out the attack, they found a group of puzzled American expats.

In a cautionary tale for those still lax with their wireless internet security, police believe the email about the explosions on Saturday in the west Indian city of Ahmedabad was sent after someone hijacked the network belonging to one of the Americans, 48-year-old Kenneth Haywood.

Of course, the terrorists could have sent the e-mail from anywhere. But life is easier if the police don't raid your apartment.

EDITED TO ADD (8/1): My wireless network is still open. But, honestly, the terrorists are more likely to use the open network at the coffee shop up the street and around the corner.