'Pregnant' teenager kidnapped from state custody by stepfather who is on the run from FBI with girl's mother and five siblings

Ailene Lander, 15, went missing on Monday from the parking lot of Alabama Medical Center
Police said of stepfather Charles Partin: 'We believe that anybody in his immediate control or reach could be in danger'
Partin wrote on Facebook on September 6: 'Lost my oldest daughter today to state custody over nasty rumors by her friends'

PUBLISHED: 17:50 EST, 19 September 2012 | UPDATED: 18:07 EST, 19 September 2012

A teenage girl has been abducted from state custody by her stepfather, taking her along with five siblings and the girl's mother on the run from the FBI, according to authorities.

Ailene Lander, 15, went missing in Alabama on Monday, according to staff who told police they were confronted by Charles Dean Partin.

Miss Lander had been attending a doctor's appointment at Southeast Alabama Medical Center when she disappeared from the parking lot.

Danger: Ailene Lander, 15, (back row) disappeared from state custody in Alabama and is believed to be with her stepfather Charles Partin (left) and mother Julie Bethke along with her five siblings

Staff who had accompanied Ailene said they were confronted by Partin, 36, in the parking lot who put her in a van. Some reports have suggested that the family were heading for Mexico.

The girl was under court-ordered custody according to police in Dothan who would give no further details as to why she was a ward of the state.

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According to a report by Gather.com, Ailene Lander is pregnant. Calls to the Dothan police department were not immediately returned to MailOnline.

Alabama Department of Human Resources did not respond to messages.

FBI believe that the girl's mother Julie Bethke and her five brothers and sisters were also with Ailene. Bethke could be assisting Partin in the abduction.

Vanished: The 15-year-old, who is believed to be pregnant, was at a hospital appointment in Alabama when she disappeared on Monday

On the run: The family were believed to be heading for Mexico in a light-blue Mercury Villager minivan

Dothan police Sgt Rachel David told ABC: 'We believe that anybody in his immediate control or reach could be in danger.'

Ailene's stepfather Charles wrote on his Facebook page on September 6: 'Lost my oldest daughter today to state custody over nasty rumors by her friends.

'Wherever you are Ailene we love you and miss you dearly. We will never stop crying until we see you again!'

On a Facebook profile belonging to Ailene's mother Julie Bethke, the last message posted on September 13 reads: 'To everyone who knows me, please keep my family in your prayers. I have a hearing in the morning to decide whether or not Ailene can come home.'

Two days prior to this, Ms Bethke posted: 'For those who know whats going on, I have found a few lawyers willing to take on her case, if you want to help, or want to know what I need help in, please send me a private message and I will be glad to tell you what all we need.'

Lying in wait: Staff with the 15-year-old at a medical appointment in Southeast Alabama Medical Center reported they were confronted in the parking lot by her stepfather Charles Partin

Police were on alert for a light-blue Mercury Villager minivan in which the family was believed to be traveling. None of the children have attended school this week, according to education authorities.

Ailene Lander last updated her Facebook profile on September 11 with pictures of horses.

The teenager, who has brown hair and eyes and is 5ft 5 inches, was last seen wearing a white t-shirt and pink shorts.