Why Hamas' unprecedented wave of attacks is a humiliation for Israel's legendary spy networks, say security analysts

• The Hamas militant group launched a surprise multi-front attack on Israel, killing at least 40 people.
• Israel's inability to anticipate the attack was a "colossal" intelligence failure, analysts say.
• Israel has one of the most sophisticated intelligence networks in the Middle East.

Israel was rocked by a wave of unprecedented attacks carried out by Hamas fighters on Saturday, with reports of thousands of rockets being fired into the country and gunmen roaming the streets.