Around 6 p.m. Thursday, police arrived at the Gosselin family home in Wernersville, Pa., where the exes were engaged in a verbal argument. A source close to Kate Gosselin confirms she called police.
"[Police] got there and calmed the situation down," an officer tells PEOPLE. "No one was arrested and no citations were issued."
Another source says Kate called the house to find out which babysitter was helping with the children. When she didn't approve of the caretaker, an argument with Jon ensued.
"Due to the custody agreement, Kate couldn't enter the property," the source says. "The cops had no choice but to tell Kate she couldn't go past the gate."
Distraught and in tears, Kate left and checked in to a nearby hotel.
Tears are something Kate is getting used to: In this week's PEOPLE the now single mother says, "I cry all the time, in numerous airports, in airplanes."
For more from Kate Gosselin, pick up PEOPLE, on newsstands now.