REDWOOD CITY -- Two suspected Peninsula gang members videotaped themselves threatening to kill and using a loaded pistol magazine to rough up the approximately 5-year-old son of a rival, a prosecutor said Tuesday.

Wilbert Ard, 26, and Dwayne Anthony Henry, 20, appeared in San Mateo County Superior Court on Tuesday for a hearing on a range of charges that include assault with a deadly weapon and making threats, but it ended up being delayed to April 15, District Attorney Steve Wagstaffe said.

The suspects, who were on parole, were arrested in February by Menlo Park police because they were reported being together, which is a violation of their sentencing. Police searched Ard's cellphone and found the video of the suspects pushing "a very young boy," who appeared to be 3-5 years old, Wagstaffe said.

Both suspects have pleaded not guilty. Their defense attorneys didn't immediately respond to requests for comment.

The video also shows the suspects using the loaded, 30-round magazine to push the boy's head, according to prosecutors. During the clip the suspects threaten to shoot the boy and his father, who is purportedly part of a rival gang. At one point a suspect loads a bullet into a gun and threatens the child with the weapon, Wagstaffe said.

Authorities haven't identified the boy or his father but have some leads, said Wagstaffe. It wasn't immediately clear how the men ended up with the boy.

Ard and Henry are being held at the San Mateo County Jail in lieu of $250,000 bail.

Contact Joshua Melvin at 650-348-4335. Follow him at Twitter.com/melvinreport.