EXHIBIT 99.5 [FELDMAN WEINSTEIN LLP LETTERHEAD] June 12, 2003 VIA FACSIMILE (508) 248-5588 ------------- FiberCore, Inc. 253 Worcester Road P.O. Box 180 Charlton, Massachusetts 01507 Attn: Steve Philips Re: 5% Convertible Subordinated Debentures and...

                                                                    EXHIBIT 99.5

                       [XXXXXXX XXXXXXXXX LLP LETTERHEAD]



June 12, 2003

VIA FACSIMILE (000) 000-0000
-------------

FiberCore, Inc.
000 Xxxxxxxxx Xxxx
X.X. Box 180
Charlton, Massachusetts 01507
Attn: Xxxxx Xxxxxxx

            Re:   5% Convertible Subordinated Debentures and Warrants of
                  Fibercore, Inc.
                  ------------------------------------------------------

Dear Xx. Xxxxxxxx:

      I have been instucted by my clients, Riverview Group, LLC, Laterman & Co.
and Forevergreen Partners (the "Investors"), to fomally notify Fibercore, Inc.
and Fleet National Bank, N.A. that Fibercore, Inc. is in default of the
Company's 5% Convertible Subordinated Debentures.

      The Investors reserve all rights, legal, equitable or otherwise, in this
matter.

                                    Very truly yours,

                                    /s/ Xxxxxx X. Xxxxxxx

                                    Xxxxxx X. Xxxxxxx