  We present a multiwavelength study of the X-class flare, which occurred in
active region (AR) NOAA 11339 on 3 November 2011. The EUV images recorded by
SDO/AIA show the activation of a remote filament (located north of the AR) with
footpoint brightenings about 50 min prior to the flare occurrence. The kinked
filament rises-up slowly and after reaching a projected height of ~49 Mm, it
bends and falls freely near the AR, where the X-class flare was triggered.
Dynamic radio spectrum from the Green Bank Solar Radio Burst Spectrometer
(GBSRBS) shows simultaneous detection of both positive and negative drifting
pulsating structures (DPSs) in the decimetric radio frequencies (500-1200 MHz)
during the impulsive phase of the flare. The global negative DPSs in solar
flares are generally interpreted as a signature of electron acceleration
related to the upward moving plasmoids in the solar corona. The EUV images from
AIA 94 \AA reveal the ejection of multiple plasmoids, which move simultaneously
upward and downward in the corona during the magnetic reconnection. The
estimated speeds of the upward and downward moving plasmoids are ~152-362 and
~83-254 km/s, respectively. These observations strongly support the recent
numerical simulations of the formation and interaction of multiple plasmoids
due to tearing of the current-sheet structure. On the basis of our analysis, we
suggest that the simultaneous detection of both the negative and positive DPSs
is most likely generated by the interaction/coalescence of the multiple
plasmoids moving upward and downward along the current-sheet structure during
the magnetic reconnection process. Moreover, the differential emission measure
(DEM) analysis of the active region reveals presence of a hot flux-rope
structure (visible in AIA 131 and 94 \AA) prior to the flare initiation and
ejection of the multi-temperature plasmoids during the flare impulsive phase.
