Five homes in West Yorkshire have been searched by police investigating last week's London bombings. Anti-terror officers launched the raids in the Leeds area at about 0630 BST but so far have made no arrests. The operation came as Sir Ian Blair, Met Police Commissioner, warned another attack on London was "likely". Parts of Colwyn Road and Tempest Road in the Beeston area, south of Leeds city centre, have been sealed off by police. Sir Ian confirmed the raids were part of the bombing investigation. He said: "There have been a series of searches carried out in Yorkshire. Those searches are still going on. "This activity is directly connected to the outrages on Thursday." Speaking on BBC London, the commissioner said London, as well as New York, continued to be "major terrorist targets". He said: "Another attack is likely, there's no question about that. When, who knows." The Yorkshire searches were carried out after warrants were issued under the Terrorism Act 2000.