"The US government is shocked and deeply saddened by the tragic loss of lives caused by a deliberate act of terrorism early this morning on the Samjhauta Express, linking Delhi and Lahore", a US Embassy statement said in New Delhi.
"Such acts can only strengthen the resolve of all well-intentioned people to defeat terror and achieve peace", it said.
The US government extends its condolences to the victims of this "criminal act" and their families, the statement added.