Bangladeshi "Shontrashi"s hiding in kolkata started getting caught with the aid of informers and these informers are fearing assassination as Indian authority is freeing the terrorists on bail. They say that BD did not return any indian "shontrashi" after they had handed over some Bangladeshi terrorists before.
The bail of these terrorists might let them unite their followers already on hiding, which in turn might re-create lawlessness in Bangladesh.
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﴾اَلَاۤ اِنَّ اَوۡلِيَآءَ اللّٰهِ لَا خَوۡفٌ عَلَيۡهِمۡ وَلَا هُمۡ يَحۡزَنُوۡنَ ۖ ۚ ﴿۶۲
"Listen, the friends of Allah shall have no fear, nor shall they grieve" (Yunus: 62)