The father of the sole surviving victim, the cafe's chef, told Reuters that police detectives had said the gunman was known to have had "psychiatric problems" and caused a disturbance at the coffee house a few days earlier.
The burst of gun violence prompted a security alert and lockdown at several Seattle schools and city-run community centers. Residents were advised to stay behind closed doors as police searched for the suspect.
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http://www.reuters.com/article/2012/05/31/us-shooting-seattle-idUSBRE84U03M20120531