Hamas duped Israel into thinking it wasn't preparing an attack by posting misleading messages on private channels that it knew Israel was monitoring, security officials say

• Hamas' deadly attacks last weekend were the worst breach of Israel's security apparatus in decades.
• They carried out the attacks, in part, by posting misleading messages on monitored channels, NYT reported.
• The messages falsely said Hamas was not preparing to strike, NYT reported.

Hamas' deadly attacks in Israel last weekend marked the worst Israeli intelligence failure in decades.