WCBSTV reports: The man at the center of a suspected New York bomb plot admits having ties to terrorism.

The Colorado man suspected in a New York City subway plot has provided a partial confession to investigators, admitting ties to terrorism but downplaying his involvement in any specific terrorist attack.

Prosecutors are now looking at possible charges that could be brought against him.

Bob Strang is a terrorism expert who said the FBI’s intense pressure on Zazi’s family may have been what caused him to crack and make the partial confession.

“This has been a hot case, something the government has been focused on for a while and it is now just coming to a head,” Strang told CBS 2 HD.

The ties between Najibullah Zazi and al-Qaida are growing. A source who gets high-level intelligence briefings told CBS 2 HD that law enforcement officials have recorded a number of conversations between Zazi and a known al-Qaida operative in Pakistan.

The key parts of the conversation? The operative told Zazi what to say if stopped by police, and there is also a reference to a “wedding,” which American agents believe is a code word for an attack.

Sources said the formula for the explosive TATP was found in Zazi’s computer when they seized his car, and with President Barack Obama coming to the UN next week, the FBI felt it needed to act.

Earlier in the week, Zazi had denied terrorist ties.

“I have nothing to do with al-Qaida, any link or anything to do with al-Qaida,” Zazi said.

Investigators are trying to determine the extent of Zazi’s self-confessed links to terror, even looking at his possible connections to al-Qaida. FBI agents will questions Zazi’s father later Friday.

“They are talking to his family. They are going to go all over, so what he is trying to do is reduce the pressure that is put on his family and on himself and give perhaps give the government some tips and information that might help them,” Strang said.

Over the 9/11 weekend, Zazi was in Queens. On Monday, agents raided homes in Flushing where Zazi had been a guest, recovering backpacks and cell phones, among other items.

Authorities said those items were not uncommon until you factor in trips they said Zazi took to terrorist training camps in Pakistan, where he learned about bombs and had contact with al-Qaida.

Later, while in Queens, officials said Zazi inquired about hydrogen peroxide, which terrorists use to make bombs.

“It talks about peroxide and it talks about the burns, the possibility of someone being burnt,” NYC Police Commissioner Ray Kelly said. “But I think it covers more subjects than just that.”

Zazi is a 25-year-old airport shuttle van driver. He’s staying with his parents near Denver.

(Source: WCBSTV)