Colombia city power grid attacked

Colombia's main port city has been left without electricity after left-wing Farc rebels attacked its power installation, police say.
Friday night's incident in Buenaventura came after at least two days of grenade attacks, which have left at least 24 people injured.
Police said they had arrested children who were used in the grenade attacks.
The unrest comes a week before Colombia holds a presidential poll, in which Alvaro Uribe is seeking a second term.
Farc (Revolutionary Armed Forces of Colombia) is opposed to Mr Uribe, who has vowed to wipe them out with military force.
Analysts say the rebels are trying to show his strategy has not succeeded.
The provincial governor called on Farc to halt hostilities following the latest violence in the city of 400,000 residents.
"It is not right for this population of poor people [to] be victimised by these violent acts," Angelino Garzon said.
Farc has been fighting the government for more than four decades.