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Activity in low-mass stars is an important ingredient in the evolution ofsuch objects. Fundamental physical properties such as age, rotation, magneticfield are correlated with activity. Aims: We show that two components of thelow-mass triple system LHS 1070 exhibit strong flaring activity. We identifythe flaring components and obtained an improved astrometric solution for theLHS 1070 A/(B+C) system. Methods: Time-series CCD observations were used tomonitor LHS 1070 in the B and I_C bands. H-band data were used to obtainaccurate astrometry for the LHS 1070 A/(B+C) system. Results: We have foundthat two components of the triple system LHS 1070 exhibit photometric activity.We identified that components A and B are the flaring objects. We estimate thetotal energy, ~2.0 x 10^{33} ergs, and the magnetic field strength, ~5.5 kG, ofthe flare observed in LHS 1070 B. This event is the largest amplitude, \Delta B> 8.2 mag, ever observed in a flare star.

Identification of strong photometric activity in the components of LHS 1070