NEWARK, N.J. (CBSNewYork/AP) — Testimony has resumed in the trial of one of six men and boys charged with murdering three college-bound friends in a Newark school yard.

Prosecutors contended Alexander Alfaro wielded a machete during the attack.

Dashon Harvey, Terrance Aeriel and Iofemi Hightower were lined up against a wall behind Newark’s Mount Vernon School and shot in the back of the head in August 2007.

A fourth victim who survived being stabbed and shot in the brutal attack testified Wednesday.

On Thursday, jurors are expected to hear from detectives who found a machete used in the attack and others who questioned the survivor.

Two other defendants are already serving life sentences.

(TM and Copyright 2011 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2011 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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