Four Rohingya Muslims refugeesa woman and three children -- were arrested in Tripura's Unakoti district for staying in India without valid documents, police said on Tuesday.Acting on a tip-off, police raided a house in Yeazikhaora village under Irani police station limits and arrested them on Monday, Officer in-charge of the police station, Alamgir Hossain, said.It is not yet to be ascertained whether she is the mother of all the children.The refugees were produced before Kailashahar Sub- Divisional Judicial Magistrate's (SDJM) court on Tuesday.The SDJM sent the three minors to a juvenile home and remanded the woman to judicial custody for 14 days.During preliminary interrogation, the woman said they came to India to visit relatives by crossing the Indo- Bangladesh border illegally and reached Assam with the help of a person, Hossain said.At least 50 Rohingya refugees were arrested in Tripura since January.On January 18, 31 Rohingya Muslims were arrested by the BSF from the no-man's land of the Indo-Bangladesh border at Kamalasagar in Sepahijala district. Nineteen other Rohingiyas were taken into custody from Ashabari village adjoining the international border in the same district on February 26.