FORT HOOD, Texas (AP) — Witnesses have started to describe what happened outside the medical building where the Army psychiatrist accused in the 2009 Fort Hood shooting opened fire on unarmed soldiers.

Maj. Nidal Hasan could face the death penalty if convicted of premeditated murder and attempted premeditated murder. Prosecutors have called 74 witnesses heading into Friday, the ninth day of the trial.

Prosecutors are expected to call an FBI agent and others who witnessed and investigated what happened after Hasan left the Soldier Readiness Processing Center building where the shootings occurred.

Two police officers helped take down Hasan, paralyzing him in the process.

For two days, pathologists described how dozens of bullets hit and killed 13 people.

Hasan is representing himself. He has remained mostly silent throughout testimony.

MICHAEL GRACZYK,Associated Press
NOMAAN MERCHANT,Associated Press

Copyright 2013 The Associated Press.