FBI agents working on the Gabrielle Giffords shooting encountered trouble gaining entry to the suspect's family home Monday morning.

Family members of Jared Loughner apparently had put on 4-by-4 double-thick plywood that blocked access to the front porch of their north Tucson home.

At about 12:25 p.m., agents began banging on the blockade, yelling, "This is the FBI. Let us in."

Some agents were sent behind the house, and they were able to get inside after talking to family members.

It's not immediately clear why the Loughner family had put up the blockade, but there were reports of at least one media representative who had gotten to the yard of the family home earlier in the day. Loughner remains in custody and has an appearance in federal court later Monday.