Authorities say a Northern California man was injured when a pipe bomb hidden inside a Sunday newspaper exploded as the man reached for the paper from his driveway.

The blast at about around 10:20 a.m. Sunday forced the evacuation of surrounding homes in a cul-de-sac in Vacaville, which is located between San Francisco and Sacramento. Vacaville city spokesman Mark Mazzaferro says a bomb squad from Travis Air Force Base is helping to search the cul-de-sac for other potential explosives.

The victim was airlifted to a hospital although the extent of the person's injuries wasn't immediately clear. It also wasn't clear whether the attack was random or the man was targeted.

Residents within a roughly half-mile radius have been advised not to approach any suspicious packages.