paris/geneva switzerland send tunisian couple include brother man presume kill two people knife attack french train station back home country security reason swiss federal police say tuesday couple arrest swiss town chiasso near swiss-italian border sunday night seek asylum detain pending expulsion swiss federal police say give date man know foreign police service link jihadist terrorist movement role marseille attack clear swiss federal police say statement give name age couple early source close investigation say tuesday swiss detain two tunisians want connection deadly knife attack marseille train station oct. 1. swiss police confirm one two detain brother 29-year-old ahmed hannachi shoot dead french soldier kill two young women outside station southern france authorities investigate attack probable terrorist act hannachi young brother anis arrest italy early month 240 people kill france since 2015 attack assailants pledge allegiance say inspire islamic state group early month french parliament adopt counter-terrorism legislation increase police surveillance power make easy close mosques suspect preach hatred law civil right group say would infringe personal freedoms swiss police expel two tunisians link marseille attacker