It was expected that these groups would clash with each other.

And even as he spoke, just outside the mansion, two raucous groups of protesters were clashing.

The two Shiite groups have frequently clashed in the past.

And then, before the two groups could clash, the natives paused.

These groups could clash violently over water rights, pasture, and religious beliefs.

The protest was generally peaceful, but a small group clashed with police.

These two groups clashed in street fights and riots, eventually leading to murders.

The two groups clash due to their different academic and social classes.

This group has clashed with traditional believers since its creation in the early 1990s.

A group of teenagers clashed with police outside a nightclub in Melbourne early this morning.