Amy Carey-Jones says the Thursday shooting of Miriam Carey was "not justified." Another sister, Valarie Carey, says there was "no need for a gun to be used when there was no gunfire coming from the vehicle."
The sisters were speaking late Friday outside Valarie Carey's home in Brooklyn after traveling to Washington to identify Miriam Carey's body.
Attempts to reach police in Washington for comment early Saturday were unsuccessful. Officials previously said circumstances leading to the shooting remain under investigation.
Carey's family says she had been suffering from postpartum depression with psychosis but was not dangerous.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.