  We investigate the physical properties and electronic structure of
BaFe2-{\delta}Se3 crystals, which were grown out of tellurium flux. The crystal
structure of the compound, an iron-deficient derivative of the ThCr2Si2-type,
is built upon edge-shared FeSe4 tetrahedra fused into double chains. The
semiconducting BaFe2-{\delta}Se3 with {\delta} \approx 0.2 ({\rho}295K = 0.18
{\Omega}\cdotcm and Eg = 0.30 eV) does not order magnetically, however there is
evidence for short-range magnetic correlations of spin glass type (Tf \approx
50 K) in magnetization, heat capacity and neutron diffraction results. A
one-third substitution of selenium with sulfur leads to a slightly higher
electrical conductivity ({\rho}295K = 0.11 {\Omega}\cdotcm and Eg = 0.22 eV)
and a lower spin glass freezing temperature (Tf \approx 15 K), corroborating
with higher electrical conductivity reported for BaFe2S3. According to the
electronic structure calculations, BaFe2Se3 can be considered as a
one-dimensional ladder structure with a weak interchain coupling.
