A seal segment is provided for a shroud ring of a rotor of a gas turbine engine. The seal segment is positioned, in use, radially adjacent the rotor. The seal segment includes a body portion having front and rear sides which each contain a respective slot that extends in the circumferential direction so that a respective hook formation is insertable into each slot for attaching the seal segment to the engine casing. The body portion is formed from continuous fiber reinforced ceramic matrix composite, reinforcing fibers of the composite wrapping around each slot so that, at the base of the slot, the reinforcing fibers are parallel to the surface of the body portion.