After his latest conversation with Vladimir Putin,

"It is patently unlawful to punish individuals for the crimes of their relatives," the family's lawyers said in a lawsuit challenging their immigration detention."Such methods of collective or family punishment violates the very foundations of a democratic justice system."

The family members include Mr Soliman's wife, Hayam El Gamal, 41, as well as the couple's 17-year-old daughter, two other daughters and two sons.They are being held at an immigration detention centre in Texas, over 900 miles (1,450km) from their home in Colorado.Department of Homeland Security officials have said that Mr Soliman arrived in the US on a tourist visa in August 2022. That visa expired the following year. He made an asylum claim in September 2022.

According to police documents, the suspect told officials that he "never talked to his wife or his family" about his plans, and that he had left a phone in a desk drawer with messages to his wife and children. His wife turned the phone in to authorities.One of Mr Soliman's daughters was recently awarded a scholarship by a local newspaper in Colorado Springs. A profile in the Gazette newspaper noted she "was born in Egypt but lived in Kuwait for 14 years" and relocated to the US two years ago.

After his arrest, Mr Soliman told police he planned the attack to take place after his daughter's high school graduation, according to the FBI.

On Wednesday, Homeland Security Secretary Kristi Noem said the agency was "investigating to what extent his family knew about this heinous attack, if they had knowledge of it, or if they provided support to it"."It is patently unlawful to punish individuals for the crimes of their relatives," the family's lawyers said in a lawsuit challenging their immigration detention.

"Such methods of collective or family punishment violates the very foundations of a democratic justice system."The family members include Mr Soliman's wife, Hayam El Gamal, 41, as well as the couple's 17-year-old daughter, two other daughters and two sons.

They are being held at an immigration detention centre in Texas, over 900 miles (1,450km) from their home in Colorado.Department of Homeland Security officials have said that Mr Soliman arrived in the US on a tourist visa in August 2022. That visa expired the following year. He made an asylum claim in September 2022.