Updated

Former Connecticut Sen. Joe Lieberman says failures by national security agencies tainted investigations into the Boston bombing plotters — and says the scheme could have been discovered beforehand.

Lieberman testified Thursday at a House Homeland Security Committee hearing on the attacks. He says it would hard, but not impossible, for law enforcement to uncover the bombing plot before the Tsarnaev (tsahr-NEYE'-ehv) brothers allegedly set off two blasts that killed three people and injured more than 100 people last month.

Lieberman says that the failure to communicate vital information between agencies was a major flaw in government oversight.

The former lawmaker acknowledges the blizzard of information confronting national security agencies. He says officials often struggle to, quote, "separate the wheat from the chaff" in pinpointing threats.