Aside from the obvious “crime does not pay,” several other conclusions can be drawn from an account of the three bank robberies carried out on two days last year in the up-and-coming NoMa neighborhood of Washington D.C.

In addition, a visit to a branch of the D.C. public library figures in the account given by prosecutors of the robberies and adds to its interest.

According to a statement released on Friday by federal prosecutors, the proceeds of all three robberies together amounted to $6,577. It is a tidy sum, but one that would make many people question whether it was worth the risk entailed in three offenses that prompt a particularly energetic law enforcement response.

Based on the statement from the U.S. Attorney’s office for the District, it could also be said that the robber worked quickly. The three robberies occurred within less than 24 hours in all, the prosecutors said. They began at 3:30 p. m. April 20, and were completed before 1 p.m. on the 21st, they said.

In addition, it seemed from their statement that something about the neighborhood may have seemed attractive to the robber. All three robberies occurred on First Street NE. One bank, in the 1100 block of First was held up twice, once on April 20, and again on April 21. The other robbery was a block away, in the 1200 block of First Street.

The risks might be rated at more than average. The banks are a little more than a 15-minute walk from the Washington field office of the FBI. They are perhaps a brisk 20 minutes from D.C. police headquarters.

No weapon was shown in any of the robberies, the prosecutors said. In each instance, they said, the robber went into the bank and passed a note to a teller, demanding money. Then, they said, he left, taking with him both cash and the note.

In another unusual facet of the incidents, they suggest in a way how wide a range of visitors the city’s library branches attract. They also suggest the unusual range of activities that may be pursued there.

After the third and final robbery of the series, the prosecutors said, law enforcement officers stopped a man not far away from the scene, as he emerged from the library branch in the 100 block of L Street NW.

Although the statement did not say so explicitly, the statement suggests that the man may have used his visit to distribute cash around his person.

In their statement, the prosecutors said the man was coming out of the library “with the proceeds of the latest robbery stuffed in his shoes and pocket.”

According to the prosecutors, Tyrone Edward Wright, 47, of Washington, was found guilty in February of three counts of bank robbery after a trial here in U.S. District Court. the prosecutors said.

They said he was sentenced Friday to 64 months in prison. In addition, they said, he was also required to repay the banks the amount taken in the robberies: $6,577.