A spokeswoman for Mideast envoy Tony Blair says he has canceled a trip to Gaza because of security concerns. Ruti Winterstein said Tuesday that Blair's visit was canceled because of what she called "specific threats" against him. She did not give details. Blair's visit, set for Tuesday, was to be his first trip to the coastal territory since the Islamic group Hamas seized control of Gaza a year ago. Blair was expected to meet with traders and inspect a northern Gaza waste water project being built with international funds. Hamas was to have provided security for Blair's trip. Although Hamas has mostly pacified once lawless Gaza, shadowy extremist groups are still believe to operate in Gaza.