The number of dead was expected to rise, the sources said.
The suspected militants tried to flee after the exchange of fire there, the sources said, and continued to fire at a second security unit called in for backup from atop neighboring buildings.
The sources said the suspected militants also used explosive devices in the attack.
Two security sources said 8 security personnel were injured in the clashes, while another source said that four of the injured were police officers and four others were suspected militants.
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