Euro NCAP Test. They did the test way back in 2004 and they already hinted problems with the side impact:
http://www.euroncap.com/tests/bmw_5_..._2004/208.aspx
The test results seems to correlate to the test results done by IIHS. But note that these two institutes have different testing methodology. EuroNCAP does a side impact test and a pole test.