Family members of the suspect in the Gabrielle Giffords shooting on Monday blockaded themselves into their home north of Tucson and were refusing FBI agents' entry.

At about 12:25 p.m., agents began banging on the blockade built with 4-by-4 double-thick plywood, yelling, "This is the FBI. Let us in." The blockade is preventing access to the front porch of the home.

Some agents were sent behind the house, and media representatives could hear the agents talking with someone from inside the house.

It's not immediately clear why the family of Jared Loughner were preventing law enforcement entry. Loughner remains in custody and has an appearance in federal court later Monday.