  A new class of OH (1720 MHz) masers unaccompanied by main-line transitions
have recently been discovered (Frail, Goss and Slysh 1994). These masers lie at
the interface between supernova remnants (SNRs) interacting with molecular
clouds. We discuss three new aspects of SN masers found in the direction toward
the Galactic center: (i) the detection of a new --130 \kms OH (1720 MHz) maser
in the southern lobe of the molecular ring at the Galactic center, (ii) the
detection of extended OH (1720 MHz) maser emission from W28 accompanying the
compact maser sources and (iii) the detection of linear polarization of the
brightest OH (1720 MHz) maser in SNR G359.1--0.5.
