cairo egypt summon several western ambassadors sunday protest statement criticize country detention human right lawyer help investigate case murder italian student germany italy netherlands britain canada issue statement late friday critical detention ibrahim metwaly help investigate murder giulio regeni phd student body discover ditch outskirts egyptian capital 2016 show sign extensive torture egyptian foreign ministry statement say german dutch italian ambassadors summon procedures summon british canadian ambassadors ongoing ministry say criticism five western countries blatant unacceptable interference domestic affairs work judiciary unfortunate statement would issue countries call respect rule law principles separation power say metwaly found association families disappear son disappear four years ago take airport security september head geneva attend u.n. conference enforce disappearances members group say late say state prosecutor order detention judicial source tell reuters saturday metwaly detain charge spread false news join illegal group pre-trial detention accordance law right activists say egyptian authorities kidnap dissent keep secret jail without charge egypt deny accusations egypt summon several western ambassadors criticism right lawyer 's detention