Police administrative worker, a mother of two, was stabbed in the throat on Friday
FSB said it had seized a suicide belt, homemade bombs and automatic weapons from suspects
The suspects were detained in early-morning raids near the Danish border
Indonesia is a secular state whose constitution enshrines religious freedom and diversity
Images filmed during the altercation and widely circulating on social media show the attackers wrecking the store
The captives were kidnapped from a beach resort on a southern island last September