David Cameron wants to ensure the memorial to the victims of the July 7 bombings in London is treated with respect, the Prime Minister's spokeswoman has said.
She was speaking as photographs appeared in the Daily Express of homeless migrants apparently sleeping rough in the area around the memorial in Hyde Park.
The Express quoted attack survivor Jacqui Putnam as saying: "This is shocking behaviour and deeply offensive to the families of those who died and the survivors."
Asked whether Mr Cameron believes local authorities should take action to ensure the memorial is kept clear of rough-sleepers, his spokeswoman told a Westminster news briefing: "The Prime Minister is very clear that this is an important memorial for those who lost their loved ones or were injured or affected by the attack.
"It is there to rightfully remember and respect those victims and it should be treated as a place of remembrance and respect.
"It is clearly something for the local authority to be dealing with. From what I have seen this morning, it looks as though action has been taken to make sure it can be that place of memorial and respect."
The 7/7 memorial has 52 steel pillars, each representing one of the victims killed in the attacks carried out by four suicide bombers on three Tube trains and a bus in central London in 2005.
Mr Cameron is expected to visit the memorial as part of commemoration events to mark the tenth anniversary of the outrage next week.