  We have searched for long duration microlensing events originating from
intermediate mass Black Holes (BH) in the halo of the Milky Way, using archival
data from EROS-2 and MACHO photometric surveys towards the Large Magellanic
Cloud. We combined data from these two surveys to create a common database of
light curves for 14.1 million objects in LMC, covering a total duration of 10.6
years, with flux series measured through four wide passbands. We have carried
out a microlensing search on these light curves, complemented by the light
curves of 22.7 million objects, observed by EROS-2 only or MACHO only over
about 7 years, with flux series measured through only two passbands. A
likelihood analysis, taking into account LMC self lensing and Milky Way disk
contributions allows us to conclude that compact objects with masses in the
range $10 - 100 M_{\odot}$ cannot make up more than $\sim 15\%$ of a standard
halo total mass (at $95\%$ confidence level). Our analysis sensitivity weakens
for heavier objects, although we still exclude that $\sim 50\%$ of the halo be
made of $\sim 1000 M_{\odot}$ BHs. Combined with previous EROS results, an
upper limit of $\sim 15\%$ of the total halo mass can be obtained for the
contribution of compact halo objects in the mass range $10^{-6} - 10^2
M_{\odot}$.
