Photo: The Canadian Press

Crowd observes minute of silence in Manchester, Thursday.

Home searches across Manchester have uncovered important items for the investigation into the concert bombing that left 22 people dead, Manchester's police chief announced Thursday. A British official said Manchester police have decided not to share further information on the probe with the United States due to leaks blamed on U.S. officials.

Chief Constable Ian Hopkins said the eight suspects detained so far were "significant" arrests and said the searches will take several more days to complete. Police have swooped in on multiple addresses in the northwestern city since Tuesday and those arrested include bomber Salman Abedi's brother Ismail.

Hopkins did not elaborate on the material that has been found so far.

British Prime Minister Theresa May said she plans to discuss the leaks with President Donald Trump at the NATO summit in Brussels. She said she plans to "make clear to President Trump that intelligence that is shared between our law enforcement agencies must remain secure."

British officials are particularly angry that photos detailing evidence about the bomb used in the Manchester attack were published in The New York Times, although it's not clear that the paper obtained the photos from U.S. officials.

British police and security services were also upset that Abedi's name was apparently leaked by U.S. officials and published while British police were withholding it — and while raids were underway in Manchester and in Libya, where the bomber's father lives.

The White House had no immediate comment on the Manchester decision. Trump, in Brussels, ignored two questions from journalists on whether Britain can trust the U.S. with sensitive information.