  Using multi-wavelength observation from SDO and STEREO, we investigated the
mechanism of two successive eruptions (F1 & F2) of a filament in active region
NOAA 11444 on 27 march, 2012. The filament was inverse `J' shaped and lying
along a quasi-circular polarity inversion line (PIL). The first part of the
filament (F1) erupted at ~2:30UT on 27 March 2012, the second part of the
filament (F2) erupted at around 4:20 UT on the same day. A precursor/pre-flare
brightening was observed below filament's main axis about 30 min prior to F1.
The brightening was followed by a jet-like ejection below filament, which
triggered the eruption. Before the eruption of F2, the filament seems to be
trapped within the overlying arcade loops almost for $\sim$1.5~hr before its
successful eruption. Interestingly, we observed simultaneously contraction
(~12km/s) and expansion (~20km/s) of arcade loops in the active region before
F2. HMI magnetograms show the converging motion of the opposite polarities
resulting in flux cancellation near PIL. We suggest that flux cancellation at
PIL resulted jet-like ejection below filament's main axis, which triggered the
eruption F1 similar to tether-cutting process. The eruption F2 was triggered by
removal of the overlying arcade loops via reconnection process. Both filament
eruptions produced high speed (~1000km/s) CMEs.
