Reactive dyes of formula (1) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of the others hydrogen or unsubstituted or substituted C.sub.1 -C.sub.4 alkyl, X.sub.1 and X.sub.2 are halogen, B is a C.sub.2 -C.sub.12 alkylene radical which may be interrupted by 1, 2 or 3 --O-- members and is unsubstituted or substituted by hydroxy, A is a formazan radical of formula (2) or (3) ##STR2## D is a radical of formula (4) or (5) ##STR3## wherein m, n and R.sub.5 are as defined in the claims are suitable especially for dyeing or printing hydroxy-group-containing or nitrogen-containing fiber materials. Olive-green dyeings are obtained having good fastness properties and a high tinctorial yield.