<p>About 1,200 mink were released from cages at the M. DeMuth farm near Waverly over the weekend.</p>
<p>The incident is being investigated by federal, state and county authorities as an act of possible terrorism by militant animal-rights activists.</p>
<p>A Bremer County sheriff's spokesman said Sunday that the owner of the farm was trying to recover as many of the animals as possible.</p>