Two men, 33 and 45, were arrested and are being questioned over the discovery.The alert, which has been taking place in the Corbally Road area, has now ended and a small number of families who were evacuated have been allowed to return home.Police said the materials found inside the van have been taken away for testing.A spokesperson added: "A substantial quantity of material, believed to be fertiliser, has been removed from a Transit van which was stopped by police shortly before two o'clock this morning."The material has been taken away for detailed examination."The arrested men remain in custody at the Serious Crime Suite at Antrim police station, meanwhile the last remaining roads which were closed in Fintona are to re-open soon.A spokesperson continued: "Police apologise for any inconvenience and thank the community for their patience and support. We understand the disruption these operations can cause to the community but emphasise that the operation was necessary to keep people safe."Police enquiries are continuing."