Two men accused in a series of separate hate crime incidents in Brooklyn have been indicted by grand juries, the Brooklyn district attorney, Charles Hynes, announced yesterday.

At the announcement of the indictments, the police commissioner, Raymond Kelly, hailed the work of the Hate Crime Taskforce after a spike in hate crime complaints across the city, and he detailed a series of subtle clues that connected the suspects to their alleged crimes.

Mr. Kelly said clothing worn by Pavel Andreenko, 22, linked him to a two-day swastika-painting spree in the Sheepshead Bay section of Brooklyn in December.

Surveillance video captured Mr. Andreenko painting the swastikas, but his face was obscured, Mr. Kelly said.

Later, however, Mr. Andreenko was caught on videotape again when he was involved in a car accident.

In that video, police noticed that Mr. Andreenko was wearing the same clothing as the man in the swastika surveillance video, this time with white paint smeared on his clothes.

Police arrested him after staking out phone booths, where he had been making calls to alert police to the swastikas, in the area.

After swastikas and fliers containing derogatory statements against Jews were found along Remsen Street in Brooklyn Heights in September, Mr. Kelly said an H written in the style of a Cyrillic letter led detectives to suspect a Bulgarian man, Ivaylo Ivanov, 37, who lived down the block.

“It was a piece of the puzzle,” Mr. Kelly said. “From just about the beginning, Ivanov was in the crosshairs of the Hate Crime Taskforce.”

Police enlisted Mr. Ivanov as a police informant as a ruse to get handwriting samples that could link him to the crime, but they had not gathered enough evidence to arrest him until an arsenal of weapons was found in his apartment this month when he accidentally shot himself with one of the guns.

Yesterday, police officials went into more detail about the destructive capabilities of the bombs built by Mr. Ivanov.

Several of the bombs, including one hidden inside a toy football, were filled with ball bearings and nails to increase their destructive power, police officials said. One of the bombs was remotely controlled, the commanding officer of the police department’s bomb squad, Lieutenant Mark Torre, said, noting that remote-controlled bombs are rare and require skill to make.

One of the bombs that had been filled with nails was constructed so that it could be hung from a rafter inside a building.

Police said they did not find any literature in Mr. Ivanov’s apartment connecting him to any hate groups and said it would take weeks to finish tests on his computer equipment to determine if he had set any targets for an attack.

Local religious leaders who attended the announcement yesterday said the indictments have brought some sense of closure.

But officials noted that the Hate Crime Taskforce had taken on a new case just as the other two were coming to a close: a series of anti-black statements written inside the private elevator of Brooklyn’s first black Surrogate’s Court judge, Diana Johnson.

“There’s nothing we can do here to stop it,” Mr. Hynes said referring to law enforcement agencies. “Education, I think at the end of it, is the real key.”