Two Washington men shot in the chest near the Chesapeake & Ohio Canal Friday night remained in critical but stable condition yesterday at George Washington University Hospital.

A spokesman said both men, shot in the chest betweeb 29th and 30th Streets NW, were operated on early yesterday and remained in the intensive care unit.

The men were identified by the hospital as William Diedrich, 46, of 2323 Virginia Ave. NW and Fredriko Manna, 19, of 3130 P St. NW.

The U.S. Park Police, which is investigating the incident because they have jurisdiction over the canal and its towpath, refused to give further details about the case yesterday. No motive for the shooting has been established and no one has been arrested in the case.

D.C. Police said Friday night that Officer Thomas Dinger of the second district was writing parking tickets in the 1000 blocks of 30th Street about 10:45 Friday night when he heard a gunshot followed by what may have been several more.

Officer Dinger went to the canal to investigate and saw two victims staggering toward him. Before collapsing, Officer Dinger reported, the two men told him they had been attacked and shot.

U.S. Park Police used a helicopter Friday night to help in the search for a suspect, but no one was arrested. Park Police are continuing the investigation.