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Under the cover of darkness, a group of vandals this spring slashed an inflatable dam in the Bay Area, sending millions of gallons of water into San Francisco Bay.

The attack cost $1 million in damage, and, perhaps more destructive in drought-stricken California, wasted enough water to supply about 500 homes for a year, local officials said.

After a six-month investigation, authorities in Fremont announced Tuesday that four men – all between the ages of 19 and 21 – were arrested on suspicion of felony vandalism for the May 21 attack.

Dylan Jeffery, 21; Drake Elkhouri, 21; Gavin Palmon, 19; and Zackory Morton, 20, were detained Saturday, according to the Fremont Police Department.

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