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We present new 3-mm continuum and molecular lines observations from the ATOMSsurvey towards the massive protostellar clump, MM1, located in the filamentaryinfrared dark cloud (IRDC), G034.43+00.24 (G34). The lines observed are thetracers of either dense gas (e.g. HCO+/H13CO+ J = 1-0) or outflows (e.g. CS J =2-1). The most complete picture to date of seven cores in MM1 is revealed bydust continuum emission. These cores are found to be gravitationally bound,with virial parameter, $\alpha_{vir}<2$. At least four outflows are identifiedin MM1 with a total outflowing mass of $\sim 45 M_\odot$, and a total energy of$\sim 1\times 10^{47}$ erg, typical of outflows from a B0-type star. Evidenceof hierarchical fragmentation, where turbulence dominates over thermalpressure, is observed at both the cloud and the clump scales. This could belinked to the scale-dependent, dynamical mass inflow/accretion on clump andcore scales. We therefore suggest that the G34 cloud could be undergoing adynamical mass inflow/accretion process linked to the multiscale fragmentation,which leads to the sequential formation of fragments of the initial cloud,clumps, and ultimately dense cores, the sites of star formation.

ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- V. Hierarchical fragmentation and gas dynamics in IRDC G034.43+00.24