The suspects, a man aged 39 and a woman aged 32, were arrested on Monday in Londonderry.
They face charges of possession of explosives with intent to endanger life and possession of items for an act of terrorism, the Police Service of Northern Ireland (PSNI) said.
The man faces a further charge of collecting material last year likely to be of use to terrorists.
Both suspects are due to appear at Londonderry Magistrates Court on Saturday morning.
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? firstname.lastname@example.org