Throughout more than 300 posts, a user named "Farouk1986" reflects on a growing alienation from his family, his shame over sexual urges and his hopes that a "great jihad" will take place across the world.
While officials haven't verified that the postings were written by Umar Farouk Abdulmutallab, details from the posts match his personal history.
For example, the username also matches the alleged bomber's middle name and birth year. Farouk1986 says he is from Nigeria, the home nation of the man who allegedly tried to bring down the Detroit-bound flight. And the suspect's father says Abdulmutallab broke off ties with the family.
Those posts, beginning in 2005, show a teenager looking for a new life outside his boarding school and wealthy Nigerian family.
Most of all, they paint a portrait of someone who seems lost and needs someone to hear him.
The postings seem hastily written and are replete with spelling and grammar errors. In one, on Jan 28, 2005, he wrote: "i am in a situation where i do not have a friend, i have no one to speak too, no one to consult, no one to support me and i feel depressed and lonely. i do not know what to do."
The posts were made to an Islamic bulletin board called Gawaher, which literally translates from Arabic as "gems" or "jewels," but can also be read as "essence" or "spirit."
U.S. government officials had no immediate comment.
CBS News first reported on the postings Monday evening. The messages could not be independently verified.
Farouk1986 discussed growing up and preparing to leave his British boarding school in the African nation of Togo for college, which also matches Abdulmutallab's personal history. However, educational pursuits appear to be overtaken by a growing fascination with religion, with posts going so far as to describe his own fantasies about holy war.
"I imagine how the great jihad will take place, how the muslims will win, insha Allah and rule the whole world, and establish the greatest empire once again!!!" reads one Feb. 20, 2005, post. The words "insha Allah" are the phonetic translation of the Arabic for "God willing."
"So usually my fa(n)tasies are about islamic stuff," he continued. "The bad part of it is sometimes the fantasies are a bit worldly rather than concentrating in the hereafter."
On Jan. 28, 2005, Farouk1986 said he was writing from Yemen, and that he was learning Arabic at the Sana'a Institute of Arabic Languages. Administrators at the school said Monday that its director, Muhammad al-Anisi, has spent two days being questioned by Yemeni security officials. He remained in custody Tuesday.
Farouk1986 was enthusiastic and described parts of the city as being traditional and quiet and other parts bustling, with Western fast-food restaurants, amusement parks and gyms.
"Its quite cheap too," the writer gushed. "Yemenis are so friendly and welcoming."
Yemen's government said Abdulmutallab lived in the country for two different periods, a year from 2004-2005 and from August-December this year.
On Tuesday, Nigerian Information Minister Dora Akunyili told reporters that Abdulmutallab told his parents he wanted to study sharia law only a few months ago, something his father said he couldn't do. Abdulmutallab responded by sending a text message from an unknown cell phone number saying he never would talk to his family again, Akunyili said.
In a series of exchanges which coincide with Abdulmutallab's final year of high school in 2005, the writer also discusses his conflict between attending his high school prom and being a good Muslim. He has exchanges with other posters about proper Islamic dress, modern movies, marriage and his desire to learn Arabic.
In another posting, Farouk1986 describes how alone he feels and acknowledges feeling lust, chastising himself for not lowering his gaze around unveiled women. At another point, he warns how "the hair of a woman can easily arouse a man." He writes that he was considering getting married at 18, as his family "could help me financially." Abdulmutallab's father is a prominent Nigerian banker, but nothing apparently came of his marriage wishes.
Instead, Farouk1986 wrote that he embraced fasting.
"I felt a shield that prevented evil thoughts coming into my head," he wrote. "I felt closer to Allah."
Still, some of Farouk1986's writings offer a hopeful tone. He writes about expecting to get over his loneliness when he attends university classes and joins local Islamic groups. He discusses television and soccer, but at one point gets upset after another person posts a sarcastic remark about soccer loyalties.
"I had butterflies going through my stomach reading that," Farouk1986 wrote. "I acted hypocritically? May Allah forgive me for that. I'm very sorry. Now i feel all bad. Maybe its time to say bye bye to this thread. I'm sorry if i offended anyone. Please all should forgive me."