The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) aims to measure the neutron abundance in the final state of neutrino-nucleus interactions. This measurement will have a direct impact on our understanding of neutrino interactions and could lead to a reduction of systematic uncertainties and improvements in signal-background discrimination for future neutrino detectors. The ANNIE detector uses 30 tons of gadolinium-loaded water to enhance the neutron-caputre cross section. It is instrumented with a combination of conventional photomultipliers and novel Lare Area Picosecond Photodetectors (LAPPDs). After a background characterization phase, the detectors has been installed in the Booster Neutrino beam at Fermilab and has begun taking data. This presentation will show first data from the ANNIE experiment.