A court on Monday sent to seven days police custody Khalistani terrorist Harminder Singh Mintoo, who was arrested here a day after his sensational escape from a Punjab prison.Delhi Police told the court that they were probing his links with Pakistan's intelligence agency ISI.Additional Sessions Judge Reetesh Singh allowed police to quiz Mintoo till December 5. Mintoo was arrested at a railway station here on Monday morning, a day after he escaped from the Nabha prison in Punjab along with another terrorist and four gangsters.