AMBER ALERT: 4-Month-Old Still Missing from Ludington, Latest Updates

3:30 PM UPDATE: Ludington Police say Sean Phillips has been charged with kidnapping. Sean Phillips is the father of Katherine's older sister, last night he was charged in connection with her disappearance. Officers arrested him in the area of Millerton & US-31, near his parents home. This afternoon police sectioned off that area. Sean Phillips is being held in jail, he has not told police anything about where Katherine could be. Police continue to search for Katherine who they believe is alive. Police are asking anyone with information to call police or the Silent Observer tip line. 1:40 PM UPDATE: Ludington Police are looking for potential witnesses who were seen launching a blue and white boat at the Hackert Lake/Crystal Lake public boat launch yesterday afternoon. Police say the potential witnesses are described as a family with children who were launching their boat from a silver colored 4-door pick-up truck. A 3:00 press conference is scheduled with the latest information about Katherine Phillips, who has been missing since yesterday afternoon. 9&10 News will have the press conference LIVE during a Special Report. 1:20 PM UPDATE: The 9&10 crew who is covering the disappearance of 4-month-old Katherine Phillips believes they've come across a possible crime scene. Police have surrounded the area of W. Millerton Road, just north of Scottville. Michigan State Police have a mobile crime lab at the scene. 12:00 UPDATE: Katherine Shelbie-Elizabeth Phillips hasn't been seen since yesterday around 1:15 p.m. 9&10 News has learned that the man accused of taking Katherine is her father, Sean Phillips. Sean Phillips is in police custody. Police first issued an Amber Alert for Katherine yesterday after she was taken from her home in Ludington. Police later found Sean, but Katherine is still missing. Neighbors tell 9&10 News that Phillips recently moved out and lives with his father near Scottville. Police tracked down Phillips and the car he was driving but are still looking for Katherine. AMBER ALERT: Katherine is 4 1/2 months-old. She is 2 feet tall, 12 pounds with blue eyes. She was last seen wearing pink shorts with a matching tank top with black and pink flowers. If you have any information please call 911 or Mason-Oceana Dispatch at (231) 869-5858. Stay with us here on Northern Michigan's News Leader for the latest updates throughout the day.