Frustrated by what they say is the slow and sometimes grudging way that federal officials share information about terrorist incidents, police chiefs from around the country are creating an informal network of more rapid communication. Among the leaders is William J. Bratton, the Los Angeles police chief, who said in interviews Wednesday and Thursday that while the quality of information from the F.B.I. and the Department of Homeland Security was generally good, it often arrived far too late to be of any immediate value to local police departments. Full Story