33 die in campus massacre

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A fourth e-mail is sent at 10:52 a.m.

Subject: Second shooting reported; police have one gunman in custody

In addition to an earlier shooting today in West Ambler Johnston, there has been a multiple shooting with multiple victims in Norris Hall.

Police and EMS are on the scene.

Police have one shooter in custody, and as part of routine police procedure, they continue to search for a second shooter.

All people in university buildings are required to stay inside until further notice.

All entrances to campus are closed.

Source: Virginia Tech

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Where the shootings occurred

In the deadliest mass shooting in U.S. history, a gunman killed at least 32 people before taking his own life at Virginia Tech University in Blacksburg, Va.

Timeline: Warning the campus (All times Eastern)

Virginia Tech officials sent campus-wide e-mails to faculty, staff and students on Monday as the shooting rampage unfolded.

7:15 a.m.--2 killed at West Ambler Johnston dormitory.

Approx. 9:45 a.m.--31 killed at Norris Hall, including gunman.

9:26 a.m.--E-mail announces shooting at West Ambler Johnston dormitory, urges caution.

9:30 a.m.--Campus locked down.

9:50 a.m.--Second e-mail announces gunman loose on campus, orders lockdown.

10:17 a.m.--Third e-mail announces cancellation of classes.

10:53 a.m.--Fourth e-mail announces shooting at Norris Hall, reports gunman in custody.

12:07 p.m.--Campus closed, Tuesday's classes canceled.

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Inn at Virginia Tech

Victims' families instructed to gather at on-campus hotel.

Cassell Coliseum

2 p.m. today:

Students and faculty invited to gather at sports facility for memorial.

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Source: Published reports. Graphics reporting by Brady MacDonald