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To investigate statistically whether magnetic fields in massive stars areubiquitous or appear in stars with specific spectral classification, certainages, or in a special environment, we acquired 41 new spectropolarimetricobservations for 36 stars. Among the observed sample roughly half of the starsare probable members of clusters at different ages, whereas the remaining starsare field stars not known to belong to any cluster or association.  Spectropolarimetric observations were obtained during three different nightsusing the low-resolution spectropolarimetric mode of FORS2 (FOcal Reducer lowdispersion Spectrograph) mounted on the 8-m Antu telescope of the VLT. Toassess the membership in open clusters and associations, we used astrometriccatalogues with the best currently available kinematic and photometric data.  A field at a significance level of 3sigma was detected in ten O-type stars.Importantly, the largest longitudinal magnetic fields were measured in two Of?pstars: <B_z>=-381+-122G for CPD-282561 and <B_z>=-297+-62G for HD148937,previously detected by us as magnetic. The obtained observations of HD148937 onthree different nights indicate that the magnetic field is slightly variable.Our new measurements support our previous conclusion that large-scale organizedmagnetic fields with polar field strengths in excess of 1kG are not widespreadamong O-type stars. Among the stars with a detected magnetic field, only onestar, HD156154, belongs to an open cluster at high membership probability.According to previous kinematic studies, four magnetic O-type stars in thesample are well-known candidate runaway stars.

Exploring the origin of magnetic fields in massive stars: A survey of O-type stars in clusters and in the field