[en] The border of ferromagnetism in the C14 Laves phase NbFe_2 is characterised by non-Fermi liquid properties consistent with ferromagnetic quantum criticality, but the ferromagnetic quantum critical point appears to be masked by modulated magnetic order (MMO). With our elastic neutron scattering studies of three single-crystalline Nb_1_-_yFe_2_+_y samples ranging from Fe-rich composition to a nearly stoichiometric sample we have directly determined the ordering wave vector q_1 of MMO. A weak T and H and considerable y dependence of q_1 is observed. Our inelastic neutron data is dominated by strong quasielastic scattering in the vicinity of (002) and contains further features near q_1. The results indicate that NbFe_2 could display the theoretically predicted scenario of a ferromagnetic quantum critical point, which is masked by emerging modulated magnetic order.