by looks of these 3 alone, they could be either Pakistani or any other nationality. i think the general differences are often unduly applied on an individual basis. not only are there non-Bengalis of Bangladesh, there are also Bengalis of Pakistan. on an individual basis, by looks many 'average' Bengali Muslims could blend in in Lahore and many 'average' Punjabi Muslims could blend in in Dhaka. this is from my subjective personal experience
even the guy held "named Fakhrul" may be Non-Bengali Pakistani. and his name might be correctly Fakhr ul (something), that quite a few Bangladeshis detached from learning Muslim naming conventions wrote "Fakhr - ul" as a call name. by the way these mistakes are common among many Bengali Bangladeshis.
having said all that though, i can still see BAL's-Pakistan-boogeyman-operation written all over it. Pakistan Embassy probably should help establish the truth here. and also, their passports are missing. some of my family friends are saying they are actually BAL people. BAL might randomly accuse some Muslim orgs of supporting them and use that as pretext to terrorize people in seminaries and madrasas