US President Barack Obama has condemned the Woolwich terror attack - saying there could be "absolutely no justification for such acts".

The president says the US "stands resolute" with the United Kingdom.

Drummer Lee Rigby from 2nd Battalion The Royal Regiment of Fusiliers, was hacked to death by two attackers in Woolwich, south-east London, yesterday.

Drummer Rigby, 25, from Manchester, leaves behind a two-year-old son.

Two suspects shot by police after Wednesday's attack in Woolwich remain under arrest. A further two people have been arrested on conspiracy to murder.
The suspects, one of whom is said to be Islamist protester Michael Adebolajo, were known to security services.
Scotland Yard said the latest arrests were of a man and woman, both aged 29.

Drummer Rigby's family issued a statement, saying: "Lee was lovely. He would do anything for anybody, he always looked after his sisters and always protected them. He took a 'big brother' role with everyone.
"All he wanted to do from when he was a little boy, was be in the Army.
"He wanted to live life and enjoy himself. His family meant everything to him. He was a loving son, husband, father, brother, and uncle, and a friend to many."

The British Ministry of Defence also paid tribute to Drummer Rigby.
"An extremely popular and witty soldier, Drummer Rigby was a larger than life personality within the Corps of Drums and was well known, liked and respected across the Second Fusiliers.
"He was a passionate and life-long Manchester United fan."
Drummer Rigby, from Middleton, Greater Manchester, joined the Army in 2006. He was described as a "loving father to his son Jack" and someone who would be "sorely missed by all who knew him".

Capt Alan Williamson said: "Drummer Rigby or 'Riggers' as he was known within the platoon was a cheeky and humorous man, always there with a joke to brighten the mood."
Defence Secretary Philip Hammond said: "This was a senseless murder of a soldier who has served the Army faithfully in a variety of roles including operational tours in Afghanistan.
"Our thoughts today are with his family and loved ones who are trying to come to terms with this terrible loss."
Mr Hammond was asked if the attack showed how vulnerable soldiers were, whether they were in uniform or not.
He replied: "I think it reminds us how vulnerable we all are, but it also reminds us, by the response of the public, that we are not going to be cowed by this kind of terrorist action."