Christadelphians: Who were the "angels" mentioned in 2 Peter 2:4 and Jude 6?

2 Peter 2:4 - "For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment." Jude 6 - "And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains... show more 2 Peter 2:4 - "For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment."

Jude 6 - "And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day."

Answers from other Christian groups are also welcome.
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