CNN 's Carol Jordan in London , England , contributed to this report . Norwegian , British vessels on World Food Program patrol prevent hijacking of Norwegian ship . Pirates captured after 6 p.m. chase , but then released , NATO says . Lacking formal procedure , NATO generally takes pirates ' weapons but lets them go . Saturday attack latest in a long string of hijackings and attempts in the Horn of Africa .
Norwegian , British vessels on World Food Program patrol prevent hijacking of Norwegian ship . Pirates captured after 6 p.m. chase , but then released , NATO says . Lacking formal procedure , NATO generally takes pirates ' weapons but lets them go . Saturday attack latest in a long string of hijackings and attempts in the Horn of Africa .