US President Barack Obama said he expected a 'rigorous' investigation into a sex scandal involving Secret Service agents, warning he would be 'angry' if the claims were proven true.

The US Secret Service was engulfed in a sex scandal on Saturday after a dozen agents assigned to President Barack Obama's trip to Colombia were sent home amid reports of them using prostitutes.

Five

Fears of violence marred Saturday's opening of a summit gathering US President Barack Obama and Latin American leaders when four bombs went off here and in the Colombian capital.

Two of the crude dev

In a rare move, some Secret Service agents sent to Colombia to help protect US President Barack Obama at a regional summit have been sent home amid accusations of a sex scandal, officials and reports