British Muslim convert Samantha Lewthwaite, 28, has been on the run in East Africa for six months since police foiled a plot to blow up Western tourist targets in the Kenyan city of Mombasa.
It has been revealed how the mother-of-three is the prime suspect for a grenade attack last week in a Kenyan bar, which left three dead.
The blog, Fears And Tears: Confessions of a Female Mujahid, warns of how “fear can make you do many things” and how there will be “many more challenges” in the months ahead.
Security sources believe it to be the work of soldier’s daughter Lewthwaite and that it is her first contact with the outside world since she fled to Africa with her three young children.
The rambling message, posted three days before the grenade attack, was left on the website of Islamic militant group Muslim Youth Centre, which is protecting Lewthwaite. It is the Kenyan arm of Somali terror group Al-Shabaab.
On the day of the blast, a message was posted on the site saying: “BOOM!!! Mujahideen making music.”
It is accompanied by an image of a female Hamas fighter brandishing an AK-47 and a copy of the Qur’an.
The blog has emerged as seven officers from Scotland Yard’s Counter Terrorism Command fly to Kenya today to assist in the hunt for Lewthwaite.
Her husband Jermaine Lindsay killed 26 other people when he blew up a Piccadilly Line Tube train near King’s Cross during the London attacks in 2005.
Kenyan police have linked Lewthwaite to the attack on the Jericho Beer Garden, which was packed with tourists watching the Euro 2012 match between England and Italy on June 24. A boy was among the three dead.
The web diary gives a chilling insight into the mind of a female jihadist, who says she has “no regrets” about converting to Islam.
She writes: “My decision to revert [sic] to Islam is the most precious gift that my maker has bestowed upon me.
“From a previous life of sin and worshipping of worldly things I have lived for many years now as a Muslim content with serving Allah with the knowledge that I have a place in Jannah [paradise]. Like many revertees I have been tested and challenged but each time Allah has guided me towards the right path and ensured my faith in religion remains constant.”
She continues: “During April and May I faced a great many challenges. Some friends have told me I have over-reacted because I’m a woman and weak.
“Yes, I am woman but I am woman who believes in Jihad and the supremacy of Islam.
“With all this pressure I broke down in tears… Jihad is an obligation that we must accept – so today I’m over my fear and my tears are dry.”
Kenyan police have vowed to capture Lewthwaite and have increased surveillance around her possible hideouts.
A terror officer said: “The hunt for Samantha is very hot. We believe she is a main financier of terrorism activities in Kenya.”
Lewthwaite, of Aylesbury, Buckinghamshire, was charged in December with plotting to kill hundreds of British tourists after police found weapons and a bomb-making factory in one of her many Mombasa safe houses, which also acted as a makeshift bank for Al-Shabaab.
Lewthwaite, who had been travelling on the forged passport of an Essex nurse, was later released for unknown reasons.
She was eight months pregnant with Lindsay’s second child, a daughter, when he blew himself up. She had a second son by an unknown father in 2009. Her family in Aylesbury say they have not seen her for years.