Two of the nine prisoners who escaped from the Prince George's County detention center last week were arrested at a Southeast Washington apartment yesterday morning following an anonymous tip to county police.

LaRocko Keith Johnson, 26, of Southeast Washington and Robert Lee (Silky) Rogers, 21, of Landover were arrested by members of the District of Columbia police fugitive squad at 2224 Savannah Terr. SE.

The arrest came shortly after a caller to the Prince George's police "Crimesolvers" hotline placed at least one of the men at the apartment and said that the two were planning to rob a bank, police said.

The two armed robbery suspects were unarmed and arrested without incident. County sheriff's officials could not confirm that a bank robbery was planned.

Two corrections officials were said to be questioning Johnson and Rogers about whether they received inside help in making their escape. According to County Sheriff James V. Aluisi, evidence that they received assistance still is being gathered and, "there are suspects."

"The ones arrested have not given any information per se, but we're hoping that one piece of evidence will lead to another," Aluisi said.

Sheriff's spokesman Con D. Silard Jr. said he was "optimistic" that the whereabouts of the remaining fugitives will be known this week. "We know that the other seven . . . are in contact with each other."

The nine prisoners, awaiting trial on charges ranging from armed robbery to drug and probation violations, sawed through a window bar and climbed down a hand-made rope from a third-story window last Wednesday. The men escaped past two guards, raising embarrassing questions about security in the overcrowded jail.