<p>KOSHKONONG, Mo. — One person was killed and three others were injured Saturday in a shooting at a convenience store in southern Missouri, authorities said.</p>
<p>The shooting occurred Saturday morning at a convenience store in Koshkonong, a town of about 200 people on the Missouri-Arkansas border.</p>
<p>A suspect is in custody, patrol operator Charlie Kirby said. </p>
<p>No other details were immediately available. </p>
