Barack Obama added his name to world leaders who have condemned the deadly attack on a bus carrying Israeli tourists in Bulgaria.
"The United States will stand with our allies, and provide whatever assistance is necessary to identify and bring to justice the perpetrators of this attack," Obama said in a statement, calling the attack "completely outrageous."
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A colder start to the day with outbreaks of rain expected across Wales and southern England.
A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.
The reality star had filed a defamation lawsuit against celebrity gossip site MediaTakeOut.com.