Pfc. Bradley Manning's court-martial over giving troves of classified material to WikiLeaks is building toward testimony about video of a deadly U.S. airstrike in Afghanistan.

Manning's trial resumed Tuesday at Fort Meade, near Baltimore. Prosecutors began the day by presenting evidence that Manning used his work computer to access a classified Army intelligence report about the possibility WikiLeaks posed a national security threat.

The evidence indicated Manning first accessed the report Dec. 1, 2009. That's about three weeks after Manning started work in Baghdad.

On Monday, the court heard the first testimony about the 2009 airstrike in Farah province that killed at least 26 civilians in the village off Garani.

WikiLeaks tweeted in January 2010 that it had obtained encrypted video of U.S. bombings of civilians.