AceShowbiz -

Brad Pitt is ready to launch new custody war against Angelina Jolie. Rumor has it, the "Allied" actor is furious at the "Maleficent" actress for neglecting their children. Angie was in Switzerland, giving a speech in Geneva at the Office of the United Nations High Commissioner for Refugees when her caretaker dropped her daughter Vivienne and she hit her head.

According to an eyewitness, dazed Vivienne sat slumped against the wrought-iron railing in London's Hyde Park for nearly 10 minutes before she stood up. The clueless babysitter also put Vivienne's twin brother Knox on danger. She was reportedly riding a rental bike with Knox leaning on the handlebars, in a bag holder marked with a label warning that it's not safe for children.

To make thing worse, Angie was thousands of miles away from her children that day as she was in Switzerland, giving a speech in Geneva at the Office of the United Nations High Commissioner for Refugees.

"When Brad heard about all this, he was fit to be tied!" a source close to Brad tells Radar Online, "Those kids could have been hurt badly! Up until now, Angie's had Brad tarred and feathered in the press! He didn't put up a fight because he was afraid of being completely barred from seeing their six children."

The source continues, "Now, the shoe is on the other foot, and Brad's out for blood! Brad's barely allowed to speak to his own children, then Angelina takes them halfway around the world - and this happens! The tide's been turning against Angie, and Brad finally has the ammunition to get even with her! His attitude is, 'Two can play this game!' "